Charlie, I think the two are one and the same. The barrels are a bit long for a "stage coach gun" at 27 3/16". The rib is a custom replacement of 1/4" x 5/8" strap iron but nicely filed to a taper at the breech. Ser. No. is 65145 and it originally had 34" Stub Twist barrels. It is built on a 6-Frame. The stamp on the lug is indiscernable but the distance between firing pin centers is 1 3/8 exactly.
It's pretty tough to tell how the bores are because they have developed so much "patina" in them that they will likely need some serious scrubbing or even honing but there is a lot of barrel wall thickness yet. The complete locking lug is loose which is likely the reason for the custom-made strap iron locking band.
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