Keystone Locking Mailboxes with Double Deluxe Post

Locking Keystone Mailboxes Double Deluxe Post
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Retail Price:$1132.68
Our Price:$984.94
  • Free Shipping
  • In Stock
  • Ships in about 1 to 3 business days.
  • The Gaines Keystone mailbox, shown in black with polished brass, is one of our best selling locking mailboxes
  • This decorative mailbox is virtually maintenance free since it is made of cast aluminum and covered with a powder coat paint finish so it will never rust
  • The powder coat is available in several color options and complimented by several different accents to allow you to find a unique mailbox that will be a perfect match for your home
  • There is also an available decorative post cuff for the double deluxe post
  • Door Plaques and Flags are made of solid brass or aluminum
  • You can further customize your locking mailbox by adding your street name and address to the side of the mailbox in a 7 year guaranteed vinyl that will match the color of the mailbox’s accents
  • This mailbox is available as a non-locking mailbox
  • This mailbox is also available in single post mount system with a deluxe post or a standard post
  • Need an address plaque for your house? Check out our selection of Gaines HouseMark address plaques which come in combinations to match your Keystone mailbox
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Finishes and Accents

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Product Details


Item Height (inches) Width (inches) Depth (inches)
Mailbox 12.25" 10.375" 20.125"
Post 77.5" 22.75" 4"


  • Mailbox Item Number: GMMKS
  • Post Item Number: GMPKDD2
  • Locking Insert Item Number: GMZMKSLOCKING
  • Includes: Mailboxes, Post, Locking Inserts with 2 Keys Each, All Assembly Hardware
  • Manufacturer: Gaines Manufacturing
  • Shipping Weight: 68 lbs.
  • Locking: Locking mailbox.

Additional Images

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