I also have one that has a stamped Eastern Arms Company 101.7 on the left side with nothing on the right. It has a checkered stock and forearm with internal hammers. It was my Dads and it has 11 HZ stamped on all the parts. with a capital "B" no circle stamped on the lug between the barrels and all the other parts. I did notice a number 3 on the opposite side of the B on the receiver. I Just curious how old it might B and if it is truly a 311 or 5100 varient.