After 1989 German unification, Meyer-Optik became an independent company from PENTACON.
This lens was made only 100 for PB mount, 50 for Praktica mount. It might have been a Prakticar.
Optics 7 group / 8 element, MFD = 0.8m, 223g, macro goes to 1:3, filter size = ∅49mm, PB mount
(I bought this in order to complete my Prakticar collection, not to expect a great performance.)
This lens is mentioned in the japanese translation of Her. R. Hummel's book.

(See this directory > https://pbase.com/kkawakami/other_meyer_optik_35_70mm_f35_48 )