The evolution of Sinn fluid filled watches
The Sinn EZM2B UX (with some limited edition variations) is the only
current model fluid filled Sinn watch.
There has been a series of Sinn fluid filled watches.
I think it started with the model 810Q ("Q" for the quartz movement).
It appears some of those models were the first, at least for Sinn.
The Sinn 810Q Hydro (photos from namib22). Notice the dial is plain
810Q, but the case back has the added "Hydro" marking
At some point Sinn apparently decided this would work,
and they changed the dial to reflect the new capability.
This model was also made for Bell&Ross.
After that Sinn developed the flexible case back to accommodate expansion
from temperature changes. This eliminated the bubble in the fluid and the
outside the case to inside pressure differences. One watch that used this
mechanism was the EZM2 Hydro (model 403.020). Here it is with the original
stainless steel bezel and red number date wheel.
Here is the case back. The dark circle inside the engraving can move in or
out a little bit while the outer ring is fixed firmly to the case. On the watches
the entire case back is one color.
The other model I call the 403 Hydro (model 403.010). It has numbers
on the dial, white numbers on the date wheel, and the crown at "3".
(photo from orrie)
The EZM2 Hydro and 403 Hydro models were replaced by the EZM2B Hydro
or UX (model 403.030), which is the current model (with some limited edition
variations). (photo from orrie)
The "GSG 9" version put the crown at "10". (photo from pugridiron)
What comes next? Perhaps even Sinn doesn't know yet.
Thanks,
rationaltime