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Discussion Starter · #1 · (Edited)
The Ball Cal 9018 (base ETA 2892-A2) is fitted to the EM II Diver TMT and EH TMT Titanium. It is a 25 jewel, 28800vph movement with a power reserve of 42 hours.
 

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The Ball Cal 9018 (base ETA 2892-A2) is fitted to the EM II Diver TMT and EH TMT Titanium. It is a 25 jewel, 28800vph movement with a power reserve of 42 hours.


The 2892 A-2 base is a 21 jewel movement. So are their 4 additional jewels added by Ball? If so, what do the help achieve? Is it for the thermometer?

tia,

scott
 
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