the date is on the data plate just about the service valves on the outside condenser. the serial number is how you can read the manufacture date. for example, serial number 9805100565, is read as manufactured in may 1998. this is the for all goodman and amana air conditioning units.
I inherited one with a "new" home mine was made in 1994...
1977
001g06s
10 seer
1908
1947
1935 or so
You will have to contact Mossberg
You can't. You can find the serial number and from that you can get a ballpark figure on date of manufacturer
Is it a pump, over/under or semi-auto?
The gun was made in 1926.
Browning.com has sn data under customer service.