I have a Remington 870 but unlike my other 870's ( I have a few ) this one does not say Wingmaster on the side it only says Remington and the seral number. As it has no barrel so cant get date info. I have never seen on one before like this one that only says Remington on the side. I was wondering how to find the year it was made . It also has a grove in the trigger guard that I have never seen before and it was not done after market. The seral number starts with a number no letter so it must be from 1950 -1968 but is there a way to find the real year it was made ?