The 76100 is interesting indeed. It is one of the “low production” transitional watches that Tudor excelled in. The 76100 only existed with a date. Whats interesting is that it seems that it was produced along side the 94110. Optically it is identical to the later 94110 (with triangle marker matté tritium dial) – however it had different hands – including a big bubble – hours hands which is quite distinct.
Earliest 76100 serial seen is 64.000 range – which is litrally a few hundred numbers away from the last 94010. Interestingly enough the Rolex R20 manual from 1984 does not feature the 76100. This leads me to believe it was introduced in 84. To further complicate matters, the 94010 in question is a MN83 (Marine Nationale, issued in 1983) so there seems to bea gap in the serial numbers – perhaps even a production halt for a period of time ?