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

[Linked Image from photos.smugmug.com]

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.

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