Different nylon covers are known for the Zorkis. The black one is probably the less visible: it can easily be confounded with the ordinary vulcanite...
This camera was equipped with a very early Industar 26M with big ciphers (certainly not original) when bought.
Serial number__________ Lens ___________ Origin
55101328 _______ Industar 26M 000529 ___ Jacques M. coll.