Patrick,
I have scanned and uploaded the 1935 midland catalogue to photobucket. You can press ctrl and click on the link or you copy and past this link into your browser - it should link to it let me know if it doesnt.
http://s1069.beta.photobucket.com/user/o...439177495405381
I had a quick look but couldnt see your gun.
It is amazing to see that in 1935 there was a choice of several muzzle loading percussion guns on offer. Loads of hammer guns and mauser broom handles how times have changed?
There were some great names including, The Demon, Quicksure, Pioneer, Defiance, Climax, dreadnought, Knockabout and best of all The Sudden death.

As far as the proof marks go according to one of the books I have the 13 over a 1 was used between 1896 and 1904.
The diamond with a 12 over c was used between1896 and 1954.
The crown over BP, BV and NP was used from 1904 till 1954 combined with Nitro Proof.
So according to my book it is a bit of an anomaly.
The 13 over 1 dates it to 1896 1904 but the other marks suggest 1904 to 1954.
Not much help Im afraid.
Maybe someone else has a more detailed proof mark analysis.

Nice gun by the way.
John

Last edited by Oldfarmer; 02/14/13 11:18 AM.