Congrats on the purchase @Mike B! I believe those are French made tracks from the 60's. I have two sets and am in the process of rebuilding them with new bands. They are a nice design but very heavy as I am sure you know. The rubber is heavy, the embedded links are heavy...tough set of tracks, but man are they heavy. My revised version will be lighter than the original Weasel tracks - but missing the road pads. I don't really care for my purposes. Pics soon!