Dean,
Wouldn't that gun be considered a sort of pre-courser to the 0 frame, when the few orders for 20g. guns were filled on a one-off basis before a standard small bore frame was made?
A lot of the VERY early Parker lifters (first couple 1,000 S/Ns) of larger gauges measure all sorts of odd sizes since standard frame sizes were not yet established.
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B. Dudley
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