Help identifying little fab suisse omega

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Hey everyone !

Got this little cutie and i would like some help to identifying it. I don't find the caliber number... maybe under the balance wheel but i'll try to watch when the watch will stop 😀 All i can say is that it was made in 1930 and it measures 2.2cm excluding the crown.
Btw do you know how those lugs are called?



Thanks in advance !!
 
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The lugs are called “cornes de vache” in french. Literally cow’s horns.

Movement could be a 23.7. Number should be under the balance wheel, shine some light here:

Edited:
 
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Thank you !! I've put some light, all i can read is the end of the numbers :4T2