Dan,
SN 9996 is listed as a 0 grade 12 ga with 30" Plain Twist barrels and no extras as it left the factory.
SN 101 is a back action parker and there would be no surviving records. The barrel rib will tell the barrel steel. Probably "decarbonized steel" This would have been the lowest grade gun offered and was probably produced in the first year of production. What is the gauge and barrel length. Speculation aside what is engraved on the top rib? Can you post additional pictures?
Hope this is of some help.
Best regards,
Erick
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