Vostok Amphibian stands for good quality dive watches. Simple construction but solid and very affordable.
The first vintage Neptune is, recognizable by the chaptering of metal on the dial and on the dial a sunset on water .
These have become expensive collector wantohave items.
A second version, from somewhere 1997 is actually an Amphibian with a Neptune logo on the dial.
The current Neptune is a higher quality version and falls under the SE variants with padle hands.
Although this version uses the same mechanical automatic movement as the Amphibian automatic.
A nice detail is the Neptune 3 tooth logo on backcase and dial.