Hi Everyone, I hope all is well and everyone is wearing their mask in public. I have a question ... We have a used what appears to be in mint condition a Nikon 9x30 DCF Binocular being shipped to us from a recent buy from a gentleman on Astromart . From our research these started production in 1976. The Serial Number is 978993 ... does anyone have an idea of when these might have been produced ? I have read conflicting info on how long they were being manufactured, some only just in 1976 . Others mention into the mid eighties.