No sn data available that I am aware of.
Last month of production, Februrary 1944 - production ended ~4,209,nnn ~22,000 made that month.
That will depend on the make of the rifle and the age of your pump rifle.
Call Browning.
Start by posting a question here with ALL markings on the rifle. There IS no information available for some brands.
Contact the maker, Blue Book for Firearms, Proofhouse.com
To find out the age you would need the serial number of the rifle. They were made in the 1950's and 1960's. They generally price for $100 to $150.
Find a source with sn data for that maker and look it up.
Thru Savage website customer service
Find a professional appraiser.
1994. You will have to call Browning to find out the model
What is the age of a Colt rifle serial SLD25319
Your rifle can be aged based on its serial number. Please see the link below.