When you take photos, please show the date code/proofs/SN. As Lyman was a distributor, any manufacturer marks would be helpful. As has been said, there are quite a few folks interested in collecting various replica (err... "reproduction") revolvers from the many early small Italian manufacturers from the area of Northern Italy/Brescia (Armi San Marco, Armi San Paolo, Gregorelli & Uberti, MOFRA, COM, et al), to include early Pietta and Uberti revolvers.
That brings up the subject of parts and interchangeability.
After ~2000, Pietta and Uberti (basically the only Italian survivors other than Pedersoli) used CNC machining when manufacturing their guns. Prior to that, Pietta and Uberti subcontracted with many small Italian manufacturers for parts, which sometimes vary significantly dimensionally from year to year.
Just in my limited personal experience, I have an ASM (who went out of business in 2003) 1860 Army .44 BD/1994 that has different dimensions insofar as the grip assembly from earlier years (which I also have), primarily concerning the alignment of the top backstrap screws to the frame (not even a close fit), and the trigger guard, backstrap, and wood are of somewhat different dimensions/curvatures. Curiously, a replacement Uberti cylinder fits it very welI, and Uberti and ASM had a familial relationship in the 80's/90's. I also have a Pietta 1851 Navy .36 4-screw steel frame CFS (cut-for-stock) AZ/1990 and a Pietta 1862 Dance .36 3-screw steel BH/1996 which both have what I term as the "small" tail grip assembly [different from the CNC "large" tail grip assembly (2001-2014) and the "non" tail grip assembly (2015-present)] which are not interchangeable part-for-part but as a 3-piece assembly will fit any Pietta Navy or Army frame. The newer Pietta 1851 Navy CNC bolt and hand will not fit the older 90's frames, even when one tries to fit them to the older guns. Sorry to be so windy and possibly confusing.
ASM parts are virtually unobtainable (check VTI), and I think much more so with the other small manufacturers.
IMO, Malachi is spot on with his assessment, but if it a brass framed revolver I think he is a bit high even for collector purposes. I would put it at ~$200 or less.
Pictures are of the essence!
Regards,
Jim