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Where to Find Caliber 2500 A, B, C Designation?

Can anyone tell me how I can tell if the movement in an Aqua Terra is caliber 2500 A, B, or C? I looked at one today at a local AD, but I couldn't find the designation looking through the sapphire caseback. All I saw was "27 Jewels, Caliber 2500".

I'm thinking about buying an Aqua Terra before the February price increase, but I want to make sure I get the new C variant, as this has the beat rate originally specified by George Daniels (inventor of the co-axial escapement).

Is there somewhere specific that I can look at through the caseback? Thanks.

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Where to Find Caliber 2500 A, B, C Designation?

Re: Where to Find Caliber 2500 A, B, C Designation

See pic. *LINK*

Thanks A LOT, Lucretius!!!! *NM*

Re: See pic.

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0 wallclock secs ( 0.15 usr + 0.03 sys = 0.18 CPU)