Those guns were made by Crescent Firearms, You won't find many records, but it was made between 1890 and 1929.. If it's "not in gret shape" I would forget about shooting it.. In shootable condition, they should be kept under 8000 PSI chamber pressure.. You don't mention gauge, but if a 12 bore, probably worth less than $150.. The 28s and .410 bores go quite high.. MDC