Without a serial number, there is no way to answer.
1977
1912
2002.
1942
No published sn data.
1920
1918
1920 (no date code stamp)
your browning 22 was made in 1963.
Without the name of the maker there is no way to answer the question.
There is none on the Mossberg 151M due to the date of manufacture
1950