Wow thanks for all the information. I would guess this scope is of late seventies to eighties vintage but that is only a guess. It was mounted on a marlin 336 in 35 remington made in 1966. It came up with the gun nice, very clear with heavy hunting style duplex crossairs. I took it off because it was in a weaver mount that you simply pulled on the left side of the scope and it folded over via hing to allow the use of the open sights. I saw no hope for that mount to hold zero. But once off noticed the B&L marking on the bottom of the scope and the made in Japan, whiich explained to me why the optics were so clear. My experience was with cheaper 90's vintage bushnell's and was not good. Thanks again for all the data, gives me a perspective on buying used bushnells. SN