I'm trying to date my B&L scope. It's a Balvar 8B. According to my info it was made 1968-1973 in the Rochester plant. However, on the eye piece it is clearly stamped Japan. In 1973 Bushnell made the B&L scopes changing the model names but marketed them under the B&L name. In 2004 production was moved to Japan. I think my scope is 1968 or so, but why is Japan stamped on the scope?