Originally posted by Paulschuh007 52 sigma zoom-b 2 1:4-56 f:60-200mm multi -coated lens made in Japan
I would guess that this is one of your lenses:
Sigma Beta II 60-200mm, f/4-5.6. Various discussions in Pentax Forums have mentioned this lens through the years, for example:
Sigma Lense questions: 60-200mm F 1:4~5.6 & 28-70mm F 1:3.5~4.5 - PentaxForums.com
It was produced in about a dozen different camera mounts. The "52" refers to the diameter of the filter thread: 52 mm.
Welcome to Pentax Forums, and thanks for asking!
- Craig