I require a replacement crystal for a Cal 8541 Ref 910A.
Does anyone have the size specifications for the correct crystal?
Measuring the existing crystal appears to be 31.5mm while a local supplier can provide a R910 crystal but have stated the measurement is 32.6mm
Don’t bother with that replacement crystal. Before giving more advice where abouts are you located?
Located in Melbourne, Australia?
Things have progressed, new crystal and original buckle completed.
I am now having trouble with the stem and are looking for some advice...
I have purchased an original crown 4.5mm x 2.5mm Tap 10 at 0.9mm, I also
purchased an 8541 original stem.
The problem is that the stem seems to be Tap 9 at 1.0mm??
There is another stem on ebay www.ebay.com.au/itm/IWC-original-
winding-stem-854-8541-thread-90-tige-remontoir-Aufzugswelle-401/192225208765
but how can I be sure that this will be correct?
Any suggestions or help is appreciated.
