Can someone help date my LC Smith 12 gauge double barrel? It has no hammers, no ejectors but has a serial number that, from your site, says has been lost (#91633). It also has a "0" below the SN so maybe it is a No. 0 but also has a PAT D with date (photo link attached). It needs a butt plate and want to be sure I get the correct one.

Thanks for any help.