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Pentax clip-on meters - PentaxForums.com
Pentax SV | Greg Neville's photography blog
I really recommend Pentax spotmatic sp if you wanted to get into fixing film camera. And i also found out that difference serials number have a different wire color and different light
Asahi Pentax SV Meter Super-Takumar 1.8/55
Asahi Pentax Meter Light Meter Exposure Meter - Pentax SV | eBay