Pukka,
Here are some more detailed photos.
Lock work
Face of breech witness mark filed into lock after pan removed
Stamps on conversion parts and converted parts
Remaining King's proof
Stamps on brass parts
"13" on thumb piece
"12" on butt tang
"D: OF B: C" on rear of buttplate. I have contacted the The Buccleuch Collection to see if it may have passed through their hands at some point.
Storekeeper's stamp
a trace of a Broad Arrow?
Unmodified image on left, arrow outline overlay on right
Area of above images on right butt
Other stamps on wood
Behind trigger guard on bottom of stock
tail of left side lock flat
Under side plate
In ramrod channel
Just behind front pipe
Behind rear pipe
None apparent on the toe, but, who knows. The other ones are indistinct, or almost invisible. This rifle has clearly been well used in its working life.
Other interesting things. I have noted on two, this being the second, British Ordnance guns, that there is evidence that hot irons were used in some portion of the making of nail holes. What is to be made of this?
The patch box compartment was enlarged, in the field, it appears.
Mike