1967 - 1968 NOS (Salesman's Samples) Stingray

Calibre:
MST 430
Family:
Stingray
Model:
430-1120 .600
Case #:
183 430
Size:
33.5mm
Case Back:
Patent waterproof 2 part case
Water Resistance:
50m
Strap:
18mm black corfam or black leather
The Stingray is usually an automatic model - yet here is one of 2 examples that have a manual wind MST 430 movement. The dial is correctly marked, has feet to match the 430 movement, yet the back is marked anfibio. A prototype, or small production run perhaps?
All watches in my collection with calibre MST430:

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