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If it is one of the Spanish-production "O.P." ("Old Pattern") revolvers purchased by the United Kingdom during the Great War, it ought to be chambered for .455 Webley .... and would look like one of the revolvers shown below. They are the British "Sealed Patterns" for the two variants .... Top is the "Pistol, Revolver, O.P. No. 1 Mk I" and below that the "Pistol, Revolver, O.P. No. 2 Mk I" -





Spanish gunmakers began producing these revolvers within just a very few years of Smith & Wesson putting its own revolvers on the market in the United States. (Apparently Spanish patent law protected a design only if a patent was registered in Spain and the product was being manufactured in Spain ....) They were accepted models for Spanish army officers to purchase for their service revolver.

Location can make a significant difference in firearm values, of course. I see from your profile that you are located in the United Kingdom, and unfortunately I'm not familiar with values there ....

I can say, however, that it is my impression that in North America (Canada, in particular) these revolvers would have a value of only about 1/4 to 1/2 the value of a WWI vintage Webley in similar condition. From your description of this piece, I doubt that I would pay more than $150 for it .... if that.

I am a bit of a .455 "addict", so I have one example of each type, both being functional. Unfortunately, I don't recall what I paid, but am fairly sure I don't have more than $300 in the pair ..... The markings ought to indicate production by "Orbea y Cia", "Garate Anitua y Cia" or "Trocaola Aranzabar y Cia" - not that it is of much significance to you in your present state of annoyed disgust, I would imagine .....

FWIW, the images I posted above are scanned from Chamberlain' and Taylerson's "Revolvers of the British Services, 1854-1954" wherein it is noted that these revolvers suffered a very high rejection rate by War Department inspectors (in the order of 20%) so, unless such a revolver has WD acceptance marks, it did not even meet their "wartime standards" when new ......

At least some of the marks you are describing sound like they could be Enfield inspector's marks and British proofs, and the Broad Arrow is a War Department "acceptance mark", so at very least this appears to be one of the revolvers which "passed muster" and was accepted into British military service .....

The cylinders on both of my examples are just under 1.5" long - 1.48" on my No. 1 (and now that I look, the manufacturer is marked as "Orbea Hermanos Y Ca" .... Orbea Brothers and Co) and 1.46" on my No. 2 (made by Trocaola Aranzabar).

I am puzzled about the bore constriction you described in your first post ..... Is it solid steel and apparently integral with the barrel, or does it look like a "plug" of some sort? If the latter, what kind of material is it composed of? Does the reduced bore diameter extend the length of the barrel, or is it just at the muzzle? If the latter, how far does it extend?