One of the guys in the vintage Unertl group shared pictures of this Tasco he purchased. Yes, I have said before, Tasco did make an external adjustment optic way back in the day. Reportedly from trusted reliable people, the glass and clarity on them are first rate. Made in Japan ground glass. The mounts and W&E knobs…not so much.
The Tasco model is easily confused from a distance with the B&L BALvar. Which you can see below.
Regretfully I don’t know a lot about the history of either of these or why the TASCO seems to be a rip off of the more expensive and higher quality B&L. I have only seen and handled one of each brands in my entire life. It’s possible B&L sold the IP to TASCO after they decided to stop making them. I certainly don’t know.