The Chrysler gear reduction starter was introduced for the 1962 model year. 2095219 is the casting number of the aluminum housing used on 1962-1969 starters, part numbers 2095150 and 2098500. "67" denotes the housing was cast in 1967. "KOP" is likely "KCP" and is a foundry marking.
A matching armature housing should have the part number (2095150 or 2098500) with a date code, and possibly the name "CHRYSLER". "4 975" on the armature housing does not sound like a Chrysler stamping. It is not the correct format for the three digit date code. It could indicate something else. The armature housing might be an aftermarket, or other service unit.
Your starter is possibly a mix of parts from a mass rebuilder. There were several revisions to these gear reduction starters from 1962 through 1987 and rebuilt starters can have a mix of some parts that interchange from different models. Markings can vary and can be hard to read if the housings have been blasted or tumbled. Housings and internal parts were also available from aftermarket sources with differing markings. 1970 and later starters can be quickly identified externally from 1962-1969 by the presence of the two bolts and nuts attaching the brush holder to the different aluminum housing with provisions for the bolts.
An original 1974 225 Slant Six starter is part number 3755900. Casting number of its aluminum housing is 3755259.