On the Omega website, under Speedmaster there are eight choices:

Moonwatch
Speedmaster '57
Mark II
Racing
Speedmaster
HB-SIA
X-22
Z-33

Click "Moonwatch" and five different families come up, containing 30 different models:

MOONWATCH OMEGA CO-AXIAL CHRONOGRAPH (16 models)
MOONWATCH PROFESSIONAL 42 MM (7 models)
MOONWATCH NUMBERED EDITION 39.7 MM (2 models)
MOONWATCH ANNIVERSARY LIMITED SERIES (3 models)
MOONWATCH PROFESSIONAL MOONPHASE CHRONOGRAPH 44.25 MM (2 models)

Its understandable why Omega want to use the word to help sell a 44mm Co-axial watch for £1590 more than the 42mm Pro

Since Omega now use "Moonwatch" to mean all kinds of things, what's the correct, unmistakeable terminology for the actual moonwatch? "Speedy Pro 42mm Manual Moonwatch" isn't very catchy.

Classic moonwatch? Echt-moonwatch? Ur-moonwatch? FMWOTM? WMTAWTTM?