Field grade manufacture date. Archived Message Posted by Bryan Eastman on March 15, 2015, 10:18 am Looking to date my field grade 12ga. Sn# 40469 Message Thread: Field grade manufacture date. - Bryan Eastman March 15, 2015, 10:18 am Re: Field grade manufacture date. - Franklin March 17, 2015, 4:18 pm   Searching