Trematic, mysterious Swiss brand

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I have a grande total of two, now 😝

I've found very little information on the brand, as has many before me, but Mikrolisk states that the company was formed by E. Petremand in Colgny (part of Geneva), Switzerland on April 12, 1952. All of the examples I've seen have the noteworthy Felsa Bidynator (very first bi-directional auto) movement inside.

Here's my tiny collection 😀, a ref. 602 (Moonphase) and a ref. 502:



... interestingly, here's an auction from a few years ago that was selling a Trematic TDMP (ref.602) like mine, but it had the 'Tiffany & Co.' name on the dial:



I know there's a small number of Trematics among our members, so please do share yours, and any information you may have on this seemingly 'phantom' Swiss brand!
 
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Interesting that the dials advertise "Bidynator" on them. 👍
I assume they all use Felsa movements?
 
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The moonphase is gorgeous. How'd you come across them?
I just kept searching for the moon, ever since I saw @MMMD ’s 😁

Interesting that the dials advertise "Bidynator" on them. 👍
I assume they all use Felsa movements?
Yup, the Felsa Bidynator...
No idea, but I like your tiny watches 👍
Thanks, Heaps! (to use a fine @Dre salutation😀)
 
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The new one (ref. 502) a friend pointed out to me on the ‘bay and I couldn’t resist..
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Saw that one.. if one is patient, you can find them for much, much less 😉..

I spent less than a grand total for both.
Edited:
 
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Can my keystone join in?

A-Ha!

So you’re the one 😁..

I knew there was a Keystone version around here somewhere!

Thanks for sharing, Marcus!
 
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@khmt2 Have you ever seen another?

The Keystone versions do pop up for sale oft and on, I believe Hodinkee did sell one in the past year.
 
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I have a Felsa cal 693 Bidynator branded Imperial, a badge used by Buren, I think.

 
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The multi-Trematic man has finally revealed himself😉 Congrats on the lovely duo👍
 
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The multi-Trematic man has finally revealed himself😉 Congrats on the lovely duo👍
Wouldn’t have become Multi-Trematic without you, man... thanks, bro!
 
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I guess I mistakenly left off a picture of the Trematics casebacks...

...until now, I thought they were identical, but now I see that they differ, but only in a very small way...
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The larger-cased moonphase has ‘602’ on the back, and the smaller-cased, ‘twisted lug’ three-hander has ‘502’ there:
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I have seen a NOS example to sell once on a french forum, never heard about this brand otherwise. Yours look crisp !
 
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The moonphase is sharp sharp sharp! It just looks very luxurious. Timeless.