Background.

Developed in the late 1960s following the success of the military exclusive initial version. The tonneau case introduced integrated, shrouded lugs.
The Amphibia features a revolutionary self-sealing design. The wristwatch has thick acrylic crystal, gaskets made of sintered rubber together with a heavy-duty threaded case back locking ring which tightens under increased external water pressure (obviously 50+ years on the watch will require checking if is to be worn underwater).
The watch movement is the highly reliable 18 jewel Vostok 2209 calibre without a calendar complication (to maintain mechanical integrity). The Chief Designers Novikov and Belova created an innovative and highly effective divers watch at a very competitive price.
I have seen a Finnish video where an Amphibia watch was placed inside a Deep Sea Chamber - the watch is rated to a depth of 200m water resistance - it arrived at 800m before failure!

Specifics.

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