Nice acquisition.The Shimano New 105 indicates it is 1987-1989. It a bit hard to count the cogs but it appears to be a 6 six speed, as opposed to 7 speed. If so, it's 1987-1988. I had a novice racer that I was coaching during this period, who had the a Falcon Sterling, which was equipped with Shimano Santé. It was my size, so I got to test ride it and was suitably impressed. This is also the time when Falcon was attempting to re-establish itself in North America and they had a clever advertising campaign that tied into the popularity of Star Wars, using the tag line "The Empire Strikes Back".