Expand your search ... and include 'Davis', who used to work for Unertl. My scope collection spans in no particular order, those of Fecker, Unertl, Lyman (many models, 5As too), Wollensack, Davis, Winchester and other brand 3/4" and 7/8" external adjustment long-tube rifle scope.
And yet my "go to" vintage scope, for load development, is a 25X Davis. It is the brightest, clearest and most 'spot on' for the cal head - see to follow. As a bonus, they often can be had for 60 to 75% that of comparable Lyman Super Target Spots or Unertls (less their 2" varmint models, where prices have gone whacko!).
Also note the calibrated heads is really a misnomer ... as like modern scopes it gets you to the ballpark, but where it is finally set is where needed for YOU - not ME, or my eyes. Some have a slide assembly you can adjust from the outside of the tube and that will work - but only for 1 range, however, if that is the range you use all the time - go for it!