Open ended Spanner Wrench marked "GK-853-F"

This has been identified as a wrench for Harley Davidson motorbikes issued during the period 1918 - 1923. (ref Theresa Zalud)

It is listed in a 1918 catalogue thus: "GK-853, $2.00 A single drop forged wrench made to fit manifolds on 1915 - 1918 motors and side-car ball joint nuts and lock nuts.

A similar one is listed and pictured for the Model 42 WLA Solo built for the US Army. In this case it is described as a Manifold Wrench and has Federal Stock No: 41-W-1570-10 and HD No: 12003-X.

It may be that this wrench was carried through the intervening years with similar or different stock / part numbers.

This wrench was manufactured by Modern Drop Forge a company which celebrates it's 100th year in 2014.