14/1 =.702". This stamp means at time of proof it would accept a .702" gage but not accept the.710" one. It could have been anywhere in between. I have a Birmingham proofed W Richards made by J P Clabrough which has the bore marked 14. It has pre-1887 proofs though, so "Tween" sizes were not used then so could have been anywhere from accepting a 693" gage to not accepting a .710" one. It is currently just under the .710" size by a thou or two. I cannot, of course, prove it has not been altered over the years but it was my Grandfather's gun & I do not believe it was done so after he acquired it, but do not know when that was. I don't believe he bought it new.
