You will have to contact Mossberg
There is none on the Mossberg 151M due to the date of manufacture
Not listed.
No published sn data
Contact Mossberg customer service. If the shotgun does not have a serial number (not required until 1968) they will not be able to date it.
No public domain sn data available.
Contact Mossberg Customer Service through their website. That rifle was made by Mossberg for Montgomery Wards. It is a Mossberg Model 742.
No published sn data.
Without a sn, unknown.
No sn data published.
see the Browning website
This gun was made in 1947
Date of manufacture could be anywhere between 1948 and 1964. Ser. # is needed to define year.