: Hi Andy, cool indeed, thanks for sharing.
: Yours is a true beauty, very bright chrono hands and so clean
: pusher and crown stems - where most 156's seem to be always so
: dirty over there, one could think verdigris was applied at the
: source :-)...
: Your watch instead looks like new, out of a time capsule.

: Interesting this use of L5100 and giving up on the 24 hr subdial,
: but most likely it was the easiest solution - like the date-only
: 510.50x's. And the same most likely happened for the
: Silverstones and the Cortinas.
: The Sinn ad says same movement as the 140, which we know has been a
: very contentious topic ever since the (in)famous Furrer picture
: onboard the Space Shuttle - and the "Sinn 140 / 142"
: caseback inscriptions.
: Actually Sinn put the record straight in their 50th anniversary
: jubilee catalogue, stating that Furrer's watch was a 140 which
: was later superseded by the 142.
: Cheers,
: Fabrizio

A few other 'deleted subdial' 5100s -

and a deleted subdial 5012 as well -

And one of the date only 5100s as you say Fabrizio -

I like the odd-balls!