I own 2 Thompson Center Hawken flintlocks, both .50 caliber. One of them has the word HAWKEN stamped on the barrel, and one does not. The one stamped HAWKEN looks newer and has a 6-digit serial number. The other one, which looks older, has a 5-digit serial number. Does anyone know why they stamped some with HAWKEN and others they did not? I’ve also seen this on Renegades as well. Any thoughts?