Does any one have any information on the "type II" SMC-M 28mm 2.8 lens?

I have seen the description on Bojidar Dimitrov's site (copied below), but
have also had information that "many of the original cheaper Takumar
versions were re-made at the Penax factories with updated latest SMC
coatings, and given the SMC-M label. The main external difference with the
original SMC-M 28mm f1:2.8 is the lack of a thin sliver band at front of
focus ring. Optic quality of SMC-M, converted "Takumar" SMC-M, and SMC-A are
very similar."

I understand that these type II lenses are rare, but how much can I expect
to pay for one?

Thanks,
Matt

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http://www.bdimitrov.de/kmp/ .... "This lens is extremely interesting. Its
lens mount is of the "original K-mount" type, and its name associates it
undoubtedly with the M-series of K-mount lenses. On the other hand, the lens
shares its most important characteristics with the later SMC-A lens: the
linear aperture mechanism and the updated optical formula. Even the focusing
ring is of the A-style.
Guesses can be made that in 1982 Pentax was already hard at work developing
the A-series bodies and lenses, and when parts for the "original" M 28/2.8
lens were depleted, it was decided to switch to production of the new lens,
but without exposing the externally visible A-series features - electrical
contacts on the lens mount and "A" position on the aperture ring. Still,
this lens with its low production numbers is a rather unique piece of
K-mount history."

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