I've seen a few of these random Donnay borons from the early to mid 1980s pop up on the big auction site. What's missing is context. When the Prince Boron was introduced in 1982, the industry briefly flirted with the idea of boron as a feature racquet material, because it provided stiffness and power. Five years later, the same results, actually more, were achieved with less expensive materials by simply widening the beam. Back to Donnay. Donnay lost Borg in 1982 (that year again!) as an active member of their pro team, and moved to plan B. They seemed to be scraping for anything to make up for the lost hook of the effectively moot Borg Pro (yes, yes, Arias used it, but the game was moving to graphite just as Borg left). Donnay's only two flagship "boron" frames were 1984's Boron 25 and Boron 35 - the 35 even got some play on the pro tour with Pistolesi. All other Donnay "borons" may indeed be nice to hit with, play well, etc., but were hardly the Toyota Priuses of the Donnay line (where all the R & D went). Donnay continued to roll out Borg's name on frames into the later mid 1980s because it had been so marketable for Donnay before and, what the hell, he was still under contract and no one knew if he was coming back or not for a good 10 years. In short, I don't have an answer re: specs - suffice it to say that there were likely scores of 1980s Donnay frames that milked "Borg" and "boron," so seems predictable that the two terms would end up together on a frame as well.