hello folks, I have 3 in my possession- 1st is a 500C 20 ga vin G 578534 this one I believe is made in Canada. 2nd a Maverick 12ga, single slide action bar vin MV 27894 B and Nothing on the reciever except the vin ; and 3rd is a Maverick 12 ga, Dual slide action bars, and Maverick 88 engraved on the reciever vin MV 65417 D. Can anyone give an approximate date of builds please? quarterstick