Lens Brass Lens

Lens Brass Lens
I have purchased an old Sigma Zoom slr lens it has a bayonet mount with 3 brass connections can anyone help.?

I know it is not Pentax K. I can send a photo…There in no info on lens.
Lens is SIGMA ZOOM MASTER 1:3.5-4.5 35-70MM ZOOM Multi coated with 52mm filter thread.

Take it along to a Jessops store or similar.
There must be one near you.

Good luck.

ps. Look on the inside of the caps. It might have initials printed on them. Ok, I know its not a Pentax, but if it was, it would have ‘PK’ stamped in there. Get the idea ??

Good luck.

Fresnel lens melting padlock into a puddle

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