Originally Posted by Drew Hause
Which fits the original proof marks of 1896-1904 and likely with 2 1/2" chambers
The R bore was 12 = .729" - .739"
L was (I think) 13/1 = .719" - .728"
The Spanish proof date code A*2 is 1981, after slight honing to 18.6 mm = .732. What is the chamber length now?
I believe the 2 stars indicates Improved Modified choke. One star would be Full.
It was proved at 900 kg/cm2 for a service load of about 9500 psi


Cornell Pubs has an 1899 catalog repro. It might be available as a PDF and would show the model
https://www.ebay.com/itm/291034041363

It appears that the top rib extension, and possibly the barrel hanger, were reattached at some point.

Drew, Your information is most valuable!!!

I have taken the opportunity to make 2 images, one for the English marks, and one for the Spanish marks, maybe you can help me identify exactly each ones?? I know the spanish ones, so this would help others

ENGLISH MARKS
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NITRO PROOF SHOT XXXX MAXX???
Stamp in green??? why 4???
The R bore was 12 = .729" - .739" Blue
L was (I think) 13/1 = .719" - .728" Blue
Red stamp???
Diamond & Choke and mark in black???



SPANISH MARKS
[Linked Image from i.postimg.cc]

A*2 in red, date of proof: 1981
BOPE in yelow: Banco Oficial de Pruebas de España (Oficial spanish proof house)
Stamps in black: BOPE stamps
1400g en black: barrel weight
900 in green: proved at 900 kg/cm2
The stars are spanish stamps??



OTHER

[Linked Image from i.postimg.cc]

Stamp in red???
Patent in yelow???

I will get those catalogues, thanks

The ribs are unsoldered. I think they made an acid bluing, that destroyed the soft solder, that is why they are loose.