Keystone Eagle Series Mailbox Bronze with Polished Brass – KS-4A


USPS Approved Keystone Mailboxes
Elegant, distinctive design with a large capacity to hold multiple days of mail along with magazines and small packages.


Item# KS4A


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In Stock
Ships in 1-3 days



Keystone series mailboxes are built with the finest materials and feature a blend of traditional style with contemporary elegance. Each Keystone mailbox is made of heavy-duty aircraft-grade aluminum and features all stainless- steel hardware. With 39 different design and color combinations, plus three different post styles, there is a Keystone mailbox available to compliment any home or business.

• Large Size (12 1/4” H x 10 3/8” W x 20 1/8” D) holds multiple days of mail, magazines, catalogs and packages. Magazines and document mailings lay flat, preventing tears and creases.
• Crafted of aircraft-grade aluminum, all stainless-steel hardware and a rich, powder-coat paint finish.
• Solid brass faceplate and outgoing mail flag.
• Optional locking insert available to prevent mail theft.
• 39 different design and color combinations available to compliment your home’s unique style.
• 3 post styles, custom lettering, address plaques, newspaper holder and post cuff are available to accentuate your Keystone mailbox.
• Includes all installation hardware and easy-to-use instructions.




Available with 3 Decorative Door Designs


U.S. Mail in block lettering with Eagle Design

U.S. Mail in script lettering

Fleur De Lis
U.S. Mail in block lettering with Fleur De Lis design



13 Different Color and Accent Combinations for each Door Design


Standard Post


The Keystone Series Standard Post is a great addition to your Keystone mailbox and creates a beautiful, functional and seamless presentation. The Standard Post features a top-mount system and can accommodate both the optional custom Standard Address Plaque (sold separately) and the Decorative Post Cuff (sold separately). The optional Newspaper Holder cannot be mounted to the standard post, only the Deluxe Post.

Heavy Duty Aluminum Construction

Available in Black, White, Bronze, and Almond

Dimensions 54” H x 4” W x 4” D

Weight 11lbs


Deluxe Post


The Keystone Series Standard Post is the ultimate addition to your Keystone mailbox and creates a beautiful, functional and seamless presentation. The Deluxe Post features a curved brace, ball finial, decorative post cuff, and versatile mounting arm that allows for right, left, or front mailbox mounting. The Deluxe Post can also accommodate the Personalized Deluxe Address Plaque (sold separately) and the Newspaper Holder (sold separately).

Heavy Duty Aluminum Construction

Available in Black, White, Bronze, and Almond

Dimensions 77 1/2” H x 22 3/4” W x 8” D

Weight 22lbs


Double Deluxe Post


The Keystone Series Double Deluxe Post features a ball finial, two mounting beams, two curved braces and a decorative post cuff providing an elegant and functional presentation for two keystone mailboxes.

Keystone Series Double Deluxe Posts will accommodate custom address plaques and newspaper holders for each mailbox (sold separately).

Heavy Duty Aluminum Construction

Available in Black, White, Bronze, and Almond

Dimensions 77 1/2” H x 36” W x 8” D

Weight 25lbs


Multi-Mount Posts


The Keystone Series Multi-Unit Posts provide a perfect solution to meet the mailbox needs of HOAs, home builders, communities and businesses. Multi-Mount Posts are available in multiple configurations that can be customized with optional accessories for a completely distinctive appearance.

Keystone Series Multi-Unit Posts offer the ultimate flexibility in multiple mailbox mounting configurations. The extended mounting beams can continually bolt together to build one continuous display, accommodating 1 to 100 mailboxes and anywhere in between! All Multi-Unit Posts can accommodate custom address plaques and newspaper holders for each mailbox (sold separately) and decorative post cuffs (sold separately).

Heavy Duty Aluminum Construction

Available in Black, White, Bronze, and Almond


Standard & Decorative Post Address Plaques


Display your house number prominently with a Keystone Post Address Plaque. Each plaque is made of rust-proof, die-cast aluminum and can be added to any new or existing Keystone Series Mailbox and Post. Standard Post Address Plaques attach simply and securely under the mailbox using the new address plaque mounting bracket (included) and Deluxe Post Address Plaques attach to the curved brace.

Each plaque kit includes mounting bracket, plaque and mounting bolts.

Up to 6 characters in Bronze, Gold, or Silver lettering.

Available in White, Black, Bronze, and Almond.





Newspaper Holder


Heavy-Duty all Aluminum Newspaper Holder attaches easily to the Keystone Deluxe Post or Multi-Unit Post (not compatible with Standard Post). Available in 4 powder-coated finishes. Installation hardware included.



Keystone Locking Insert


Prevent mail theft by converting any Keystone Series Mailbox to a locking mailbox in seconds. Rust-resistant aluminum construction with a stainless steel lock. Includes two keys and easy to follow instructions.



Decorative Post Cuff


The Keystone Series Decorative Post Cuff offers a stylish addition to your mailbox post. Crafted of rust-proof, powder-coated aluminum, the cuff fits all Keystone series posts and easily installs in seconds.

Available in Black, White, Bronze, and Almond.


Mailbox Lettering


Personalize your Keystone Mailbox with vinyl lettering available in bronze, gold, and silver. Lettering is available on either or both sides of your Keystone Mailbox.

Up to 20 characters per side

Marine-grade ultraviolent-resistant vinyl lettering


About Gaines Manufacturing


In 1991, Gaines Manufacturing recognized the need for a line of beautifully designed and expertly manufactured mailboxes. From their inception, Gaines Manufacturing has been committed to making the highest quality mailboxes, posts, and accessories. All Gaines products are meticulously hand-crafted and assembled, combining beauty, elegance, functionality and durability. Gaines is proud to manufacture their mailboxes and accessories in the USA.


Happy Customers


For over 15 years, Mailbox World has offered our customers the highest quality mailboxes at the lowest prices available online. At Mailbox World, you will find one of the largest selections of USPS approved commercial and community mailboxes in the industry. We provide a safe and secure online shopping experience, or you can contact a mailbox specialists by phone at 1-833-929-6245.

Why shop Mailbox World over some other mailbox websites you may find online?

Low Price Guarantee – Mailbox World guarantees the lowest price on every mailbox sold in our store. We check our competitor’s website weekly to make sure we are currently advertising the lowest prices. If you ever happen to find a lower price advertised somewhere else by a licensed dealer, just let us know and we’ll beat it…. Guaranteed.

Made in the USA - All of our Mailboxes are MADE in the USA and ship from Kansas, California, Ohio, Florida, or Michigan (depending on the brand).

Fast, Free Shipping – We offer free shipping on all mailbox orders over $10,000 shipped within the contiguous United States. We can ship to AK, PR, as well as internationally. Please contact us for a quote if needed. Most stock items ship within 3 business days and custom items in about 2 weeks. Lift gate service is included for larger items.

Excellent Customer Service – At Mailbox World, our goal is to provide the best customer service in the industry. Our knowledgeable mailbox specialists are here to help and can be reached by phone, chat or email between 8:30am and 5:30pm EST. We love talking to our customers, so please reach out with any questions.

Returns - If you need to return a product, please email us at or call us at 833-929-6245. We will issue an RGA (Return Good Authorization) if that item is eligible for return. Please note: Returned goods will not be accepted without an RGA (returned goods authorization) number from us. Orders must be shipped freight prepaid and a 25% restocking fee may apply. Products must be returned in their original shipping cartons within fifteen (15) days of receipt. Custom orders and engraved items cannot be returned. Also, 4C and 4B mailboxes cannot be returned. Customer is responsible for paying the original freight and return freight costs. If for any reason the product arrives damaged or defective, we will issue an RGA for that item and send you a new product – no extra cost to you.

Contact Information:

Phone – Toll Free 833-929-6245

Email –