So SN 620 would mean that the gun was made in 1869 or 1870 and is one of the earliest Parkers known and would be extremely rare, particularly if in "pretty good shape". Also,since 14 gauge guns are first known in 1882, that makes this gun doubly rare. This would have to be a back action, underlifter, external hammer gun.
Maybe post photos and the measurements by which it is determined that this is a 14ga?
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