Sankei exhaust info for CB 750 C

[zeebo-2]

Hi bikers,
      I'm new here and need some info.  I have an extra set of nice Sankei headers for a 1980 CB 750 Custom I don't need. The only markings I can see say HMMA4. Are these original OEM headers for this bike or are they aftermarket? They appear to be well made...any comments and is there any part number id info you know of. Thanks!!!!

        zeebo

[woodsrider250-2]

stock

[OTTODOCTOR]

sankei 2069 is part #

[CANARI71]

HI

I have seen your message about an exhaust pipe for honda 750 c

Is it stil for sale  and if so could you contact me and eventualy send me a photo

Regards

Gabriel