Question to the experts: SH21 movement - 27 or 31 jewels?

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Kalli64
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Question to the experts: SH21 movement - 27 or 31 jewels?

Post by Kalli64 »

I've noticed these days that there are SH21 hand-wound movements that have 27 jewels, and others that have 31 jewels.

· C1 Morgan 3 Wheeler Chronometer : 27 jewel hand-wound Calibre SH21
· C1 Morgan Aero 8 Chronometer : 31 jewel hand-wound Calibre SH21

Why is that and what exactly is the difference?
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Re: Question to the experts: SH21 movement - 27 or 31 jewels?

Post by Amor Vincit Omnia »

Here’s a link to all the SH 21 movements on the CW Archive.

I think the 31 jewel is one with a power reserve indicator.
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Re: Question to the experts: SH21 movement - 27 or 31 jewels?

Post by Kalli64 »

Amor Vincit Omnia wrote: Fri Jul 15, 2022 2:37 pm Here’s a link to all the SH 21 movements on the CW Archive.

I think the 31 jewel is one with a power reserve indicator.
The explanation sounds logical - thanks!
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Re: Question to the experts: SH21 movement - 27 or 31 jewels?

Post by JasperCat »

Amor Vincit Omnia wrote: Fri Jul 15, 2022 2:37 pm Here’s a link to all the SH 21 movements on the CW Archive.

I think the 31 jewel is one with a power reserve indicator.
Might be the automatic ones have more jewels too... for the ones I have:
  • C60 Concept - 31 jewels - Automatic, no Power Reserve
  • C1 Grand Malvern 5 Day Automatic - 31 jewels - Automatic, no Power Reserve
  • C65 Trident Diver SH21 LE - 33 jewels - Automatic and Power Reserve
  • C65 Trident Diver Bronze SH21 LE - 27 jewels - Manual, no Power Reserve
  • C1 PowerGlow - Jewels not specified (it is a prototype though!) - Automatic, Power Reserve

So it seems the extra jewels are required for both the Power Reserve and the Automatic Rotor... although it's not 100% clear, as the C8PR I used to own, is shown as only 27 jewels, but does indeed have a Power Reserve, although Manual and some listed have as many as 35 jewels :problem:

Cheers, Gary
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Re: Question to the experts: SH21 movement - 27 or 31 jewels?

Post by thomcat00 »

And don’t forget small seconds on some of these SH21 models. ;)
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