Lot 3535

Documented Prototype Colt New Frontier Flattop/Roundtop Revolver

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Documented Prototype Colt New Frontier Flattop/Roundtop Revolver

Estimate: $4,500 - $6,500

Starting Bid: $4,000

(0 Bids)

by Rock Island Auction Company
August 23, 2026 9:00 AM CDT
Live Auction
3600 Harwood Road
Bedford, TX, US 76021

Documented Prototype Colt New Frontier Flattop/Roundtop Single Action Army Revolver with Factory Letter The included factory letter states this revolver, identified as serial number X24065, "was developed to test the feasibility of using the flattop/roundtop frame configuration in Model P production." The letter also confirms the blue and case color finishes, barrel length, caliber, and notes that it has special features including "a high profile sight and an Elliason rear sight." Although this gun was kept for reference purposes, it was shipped to a collector, John Keosayian, Chester Heights, Pennsylvania in November 5, 1996. The left side of the barrel is marked "COLT NEW FRONTIER S.A.A. .45", and the top is marked with the one-line address. The left side of the frame has the standard two-line, three-date patent information followed by the Rampant Colt. The serial number "X24065" is marked on the right side of the frame and on the butt, and "X24" is marked on the bottom of the frame. It is fitted with black checkered grips with the Rampant Colt emblem up top and the American Eagle motif at the bottom.

Manufacturer: Colt

Model: Single Action Army

BBL: 7 1/2 inch round

Gauge: 45 Long Colt

Finish: blue/casehardened

Grips: composition

Serial NumberX24065

Class: Modern Handgun

  • Provenance: The John Keosayian Collection; A Private Collection
  • Condition: Excellent. The revolver retains 99% plus of the original blue and vivid case colors with some light handling marks and a faint cylinder drag line. The grips are also excellent. Mechanically functions, but the included letter notes: "This gun is not necessarily in serviceable condition. Consequently, it should never be loaded." This is an excellent Colt prototype revolver sure to be a welcome addition to any Colt collection.

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Bid Increments
From: To: Increments:
$0 $199 $10
$200 $499 $25
$500 $999 $50
$1,000 $1,999 $100
$2,000 $4,999 $250
$5,000 $9,999 $500
$10,000 $19,999 $1,000
$20,000 $49,999 $2,500
$50,000 $99,999 $5,000
$100,000 $199,999 $10,000
$200,000 + $25,000