Mystery watch movement stamp

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Hi all. Wondering if anyone is familiar with this watch movement maker stamp. It doesn't appear in the references I have available (closest in my referenve sheets is Elgin, but I don't think that's correct.). It's from a Swiss made 17 jewel pin pallet movement that was in a Lord Lucerne watch I purchased on EBay recently. It's definitely nothing special - decent jeweling but otherwise cheaply made - but nonetheless I'm curious who made it...

[rjenkinsgb]

Ebosa?

Searching for photos of an Ebosa 25  results in several very different looking movements, however some other Ebosa movements are listed in 17jewels, here:

https://17jewels.info/movements/e/ebosa/

 

These appear to be the most likely to be the actual movement?

https://www.ebay.co.uk/itm/183525718464

https://www.ebay.co.uk/itm/387362054913

 

Edited November 16, 2024 by rjenkinsgb
Missed the first link.

[AndyGSi]

From Mikorlisk

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Thanks for the detective work!

These do appear to be the same movement:

https://www.ebay.co.uk/itm/183525718464
https://www.ebay.co.uk/itm/387362054913

Albeit the one I have has a jeweled setting for the center wheel (so 17 jewels rather than 15).

 

Edited November 16, 2024 by Feedback

[Nucejoe]

 Ebosa was a cheap pin pallet at the time, though pallets were jewelled on newer calibe,  rather hard to find one in good shape nowadays.

 I have seen lots of parts to it, in my late watchmakers stuff, including tons of balance completes, been thinking to  put one together out of  used and new parts. 

 

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I have to admit these "jeweled pin pallet" movements confuse me a bit. On the one hand there were clearly choices made in the design of this movement to cut costs - particularly the pin pallet escapement and the use of flat bridge plates screwed to column standoffs, as opposed to single-piece machined bridges. On the other hand there is jeweling in this watch that would seem to provide only a minor benefit, if any, from an engineering perspective, including the jeweled center wheel and the use of cap jewels for the 4th and escape wheels. My guess is that the objective here is to minimize costs while still allowing the movement to be advertised as a "17 jewel" movement, but it all still seems a bit odd.

Another odd design choice on this movement is the use of an "inverted" escapement: The roller table actually sits underneath the pallet fork with the impulse jewel facing upward toward the center of the balance wheel, which in turn means the roller table needs to be rectangular (rather than the usual circular design), otherwise it would be impossible to install the balance wheel with the pallet fork in place. In addition the pins on the pallet fork actually face downward, projecting into holes drilled in the main plate and engaging with an escape wheel that is nearly flush with the main plate. I'm guessing that it was designed this way so that the roller table and escape wheel could be positioned as close as possible to the main plate (and the respective dial-side pivot jewels), possibly to minimize effects of end-shake, but I'm not sure...

Edited November 18, 2024 by Feedback