this is hard for me to identify is?

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the dial does not bear the inscription swiss made, year ?. movement does not bear the cal.
 
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The movement looks like a cal 30T2 with a balance and balance cock that have been replaced by later ones - the ones of a 268 or a 285. Do you have better pics?
 
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An Omega of this vintage, early 1940s, would not necessarily have SWISS MADE on the dial.

Movement is a bit of a mess, caliber should be marked under the balance.
 
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thank you so much, it is in the Second World War, the omega emblem on the caseback gives me the impression of being different
 
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it looks a lot like omega military pilot year 1942 same cal 30t2st 16jewell but not marked on the back A M, I find the balance wheel different.
 
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As I said, the movement is an early cal 30, likely a 30t2. But, as far as I can tell from the pics, the balance and the balance cock come from a later caliber, with a ring balance but not yet the smaller inca system: 268 or 285. As per collectible value, it is a big deal! And finding the proper parts will be expansive.