Dear Jennakins . Well the normal way to prevent rusting was to cause controlled rusting its called' Browning' the Birmingham proof mark is post 1814 consistent with the Ketland & Co I cant see the rear end of the lock but if its rounded its late What is curious is the apparent guilding or worn off Lacker and why the wrist Escution appears well above the stock surface when it should be flush The stock surface allmost appears to be sanded down at some point Lucky its survived at all .The lock looks very grey like its seen naval jelly at some point. .Still there's hope it can be mellowed down .On the underside of the barrel should be ' loops 'either slotted or just a round hole where the fore end would have been once. Wow! Well we made some discoveries Bailey & Nie gives Ketland Wiliam1802 -1807 & Co 1808-1831 gun & pistol makers Steelhouse Lane & Whittall St Birmingham . Which incidently is about 90 miles from London. Again curiously old fashioned but again they made what the customer ordered & we cant get round the Proof house dates ,That Proof house is still going I used it a lot as all guns I made or' got up' Had to be sent to proof ,The London House is a shambles just does a few high end & a few odditys While Birmingham are a proper proof house And the staff capable people who do as you ask them too no silly" Black powder only" type rubbish in view , all that goes under neath just the 'Mark' being visable at least for Mls The 'gubbins' was on the tubes & action Flats on more modern BLs (Never catch on !) trust that helps .
Regards Rudyard