Strange lens

Hi to all of you!
I found this lens, and I think it's an Industar pancake lens. But it has no markings on it...what do you think?
http://www.ussrphoto.com/UserContent/252012_ind.jpg

quote:

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Originally posted by mihai.besliu

I think it's an Industar pancake lens.

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Yes. Industar-50-2.

It is for the Zenit.

Thanks to see you here, Jay! And delighted!

Amitiйs. Jacques.

Likewise delighted, Jacques! :)