When I read that the 1680 and Tudor Subs shared the case, it gave me the idea for a franken:
Use a yuki dial on a Gen tudor.
Lucked out and found a local seller of a 76100 and sent it to my smith with a yuki Dial.
The gen Tudor came with mercedes hands so I left those in.
I was going to replace the crystal and install a 127, since it had what looked like a service crystal.
Compared to my Snowflake the tophat was noticeably lower, PLUS the magnification was less on the cyclops.
But eventually I left it alone because unfortunately, the DW window did not align.
The 1680 red dials window was bigger and right justified as opposed to the Gen Tudor which was left justified.
Since it is for my own fun, and the dial mod is reversible I decided to go for it anyways.
Here is what I got: