After the 1968 gun law took effect, a new 9-digit sequence was established starting with 500121000 on January 1, 1969. Example Lookup: SN 103163: The 3,163rd gun of the first series.
A: Generally yes for Ithaca 49, but factory cleanouts sometimes shipped early receivers late. Use feature checkpoints to confirm.
The serial number often correlates with the specific version of the Model 49 you own.