We may never know now, sadly as I suspect with the “Dream Team”
of Rolf, Ludwig and Pierre Gygax long gone, those details are probably lost to history.
The possible explanation is that a small series came out with the steel hand like yours. Then someone at UN realized the red seconds hand would match the writing on the lower part of the dial, “chronometer”.
Either way, your watch is certainly original and very rare.
From the era when UN made remarkable and technologically cutting edge practical complications. I’m glad I got a front row seat😉 as did you my good man. You also have the spoils to show for participating at the level you did. A great patron!
Cheers,
Tim