Help please to identify this leather ushanka

[Dr H]

Dear Members
I would be very interested to hear more (perhaps a date?) about this unsual leather ushanka if anybody has any information to pass on please.

This was bought from a 25+ year old collection in the USA a couple of years ago. The cap is in excellent condition - it has been very well stored as the brown leather shell (with well matched, close grained hide) is very supple and has no tears, holes or stains. The size is ca. 57/58 cm. It has a grey curly Astrakhan wool fleece (which has no holes and no mothing), with brown ties to ear flaps (which are complete and strong).
There is a light blue woven silk quilted interior (with some marks to interior, but no holes and no mothing).
There are original factory marks visible to the crown of the interior (a blue/green diamond and 'MOCKBA' is visible) and in addition '83114' has been inked to the interior. It also has a subdued olive green enamelled star (high quality brass pressing with brass hammer and sickle to centre), but I can't confirm whether this was original to the cap.
Thanks very much.
Ian