I hope this is relevant and here is a picture of my G-P 7750. Only about 440 of these were produced around early to mid 1990's. ETA-based movement with small seconds at 6. Only WR to 30 metres but has a screw-down crown and diver-like, unidirectional bezel. That does not make a lot of sense to me. 34mm case. Not obvious in the picture but the 2, 4, 8, 10 and 12 indexes are applied gilt with only the bar indexes printed black.
I "inked-in" the bezel's indexes because they were difficult to read as gilt on gilt. Another anomaly is that the raised dial edge is calibrated for a central seconds hand where there is no centre one! Why is there a rail-track minutes index as well? In spite of all that I bought this watch because it appealed to me, is very accurate and I love the two-tone brushed sector dial and the coin-edge bezel.
Was this watch a sort of proto-type?
Best
Clive