My guess: an Old stock of Sk componon 60/4 apo hm same as digitar 60/4...
All the componon apo hm 60/80/90/100 play very well At f8/f11...even the 45apo hm allow 5/7mm of shift on 24x36 sensor with digitar crispiness
I had a very quick, semi-rough sortie with this lens last week (we just received our demo).
I shot it against a Schneider 60mm/5.6 APO Digitar XL (a great, very sharp lens).
To my eye, the Actar 60mm did not match it, but it came close enough to impress. Considering the price difference, this lens may prove to be a worthy addition to the Actar line.
That lens will be shown at PhotoPlus in New York City this week (booth # 358). If you're around, Capture Integration will be at booth # 249, swing by and say hi.
Steve Hendrix/CI