Serial number is 7318396, so was made in 1978. This is a Jupiter-8, 2/50 mm rangefinder Lens.
Jupiter-8, 2/50 mm Lens. 39mm Screw Mount (LTM) With Caps. No.0171791. UK Sale
Jupiter-8, 2/50 mm Lens. 39mm Screw Mount (LTM) With Caps. No.038559. UK Sale
Jupiter-8, 2/50mm Lens 39mm Screw Mount (LTM) With Front Cap - VGC - USSR Black
Canon 2.8 / 50 mm Rangefinder Lens. 39mm Screw Mount (LTM) Caps. 37841. UK Sale
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Canon 1.8 / 50 mm Rangefinder Lens. 39mm Screw Mount (LTM) Caps. 227921. UK Sale
