The 38mm f/1.9 twins

[calvin83]

They looks very similar with the same thread mount.

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[philslizzy]

I've seen these elsewhere. The Wollensak is a 1960 cine camera lens according to the Lens Vademecum. The Vivitar seems to be from that era too.

[calvin83]

Yes. Both should be made in the 60s. I believe they are some kind of industrial lens as the Wollensak can be found with the same housing too http://www.bigeye.url.tw/big5/d_wo38_19.htm .