I am looking online at a used Nikon spotting scope. My old 20X Bausch & Lomb NRA edition spotting scope just doesn't cut it any longer. At least not with these eyes! At 100 meters, my 4-16x scope gives me a better better view. The Nikon spotting scope I am looking at is a 15-45x60 model, but that and the serial number is all I have. Is there any way to look up the date of manufacture by the serial number? I have read that the older Nikon's have Japanese glass and that is a plus? Am I wasting my time and need to keep looking? I am frugal (read cheap!) and not wanting to spend a fortune. Thanks for any advice! Danny