Just measured: the pin to pin is 1-1/8".
The butt stock on the gun has a different serial from the barrels and frame, and is much earlier: 145656. It has non-cut 26" barrels (there's an obvious break in the rib waves) and was obviously exceptionally well loved/used. Given the C/M chokes, and relative light weight, I think this was someones rainy day grouse gun, which is exactly what I intent to use it for.
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