Lot 3387

Boss & Co. Assisted-Opening Sidelock Double Barrel Shotgun

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Boss & Co. Assisted-Opening Sidelock Double Barrel Shotgun

Estimate: $10,000 - $16,000

Starting Bid: $9,000

(0 Bids)

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

Factory Engraved Boss & Co. Assisted-Opening Sidelock Double Barrel Shotgun This beautiful gun was built by Boss & Co. circa 1898 according to page 238 of Donald Dallas' "Boss & Co.: Builders of Best Guns Only". The gun has black steel dovetail lump barrels featuring a single bead sight on the smooth concave game rib which is signed "BOSS & Co. 13/14 CORK STREET, LONDON, W1." (address from 1960-1982) along with a gold "2" and a flourish of floral scroll at the base, single band of engraving at the breech, London proof marks dating between 1954 and 1989, and 2 1/2 inch chambers with automatic ejectors. The barrels bear serial number "9520" on the rear lug and "4656" on either tube, indicating that they are a newer set made by Boss & Co. The barrels are mated to a casehardened assisted-opening sidelock action which displays extensive classic bouquet and scroll engraving surrounding "BOSS & Co." signature banners on either lockplate and "BOSS'S/No. 22894/PATENT" on the underside before extending to the trigger guard, both tangs, and toplever which shows a second gold "2". The gun features Boss's patented single trigger (number referenced above), gold centerline cocking indicators on either lockplate, a right hand rolled trigger guard, and a tang mounted automatic safety with gold inlaid "SAFE" indicator. The gun is fitted with a beautifully figured and multi-point checkered splinter forend with blued and engraved iron and a third gold "2" on the Anson button release, along with a straight grip stock with teardrop carved drop points, a blank gold inscription oval, and a Silver's style recoil pad. Barrel and stock measurements (R/L): bore diameter nine inches from the breech both proofed and measured at .729 inches; choke constriction .003/.011 inches; minimum wall thickness .033/.028 inches; 1 1/2 inch drop at comb; 2 3/8 inch drop at heel; 15 1/16 inch length of pull; cast-off; weight 6 lbs. 14 oz.

Manufacturer: Boss & Co

Model: Double Barrel

BBL: 28 5/8 inch solid rib

Stock: walnut

Gauge: 12

Finish: black/casehardened

Serial Number4656

Class: Antique

  • Condition: Exceptionally fine as professionally restored, retaining 99% black and casehardened finishes, some loss of gold on the "SAFE" marking, minor handling evidence, and sharp checkering on the stock and forend. Mechanically excellent.

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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