This beautiful watch houses the smallest movement I’ve ever worked on. Thing is, I don’t know who made it. I’ll tell you what I know and if you can tell me difinitively who made it, I’ll send you this beautiful Gerald Genta Catalog I mentioned in my post on catalogs because they sent me two.

The watch is cased in Platinum and Diamonds. There is no name on the dial, movement or case. The dial is signed Swiss. The only identifying mark is this mark inside the case back. It looks like it might be JKCo?

The movement measures 2 3/4 lignes by 7 1/4 lignes. It is an 18 jewel backwind movement adjusted to 8 positions and it bears the Seal of Geneva. It has a serial number but I don’t see any makers marks anywhere. I have completely serviced the movement and it is in great working condition.

So, if you’re wondering how small is 2 3/4 lignes by 7 1/4 lignes. Here you go. The Jaeger Lecoultre 101 is the world’s smallest mechanical movement. It’s tiny. Here is a picture of my mystery movement next to an actual size photo of the JLC 101 The watch is so small it wouldn’t fit in my smallest movement holder. I had to modify my holder so I could support it. I turned the sliding support of my holder around backward and filed a new support groove in it so it would close down tight enough to support the watch. Oh and here is a picture from the beautiful catalog you’ll get if you can help me out. P.S. If you know anything about this watch post the information about the watch (and not your contact info) as a comment for this post and use an e-mail I can reach you at to get your contact info (your e-mail won’t be visible to the public.)

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