Omega 2348/1 vintage 35mm 30T2SC

Hello, looking to buy my first vintage Jumbo, here is the seller description:

1949-1955 cal 30T2 SC mechanical movement, serviced November 2023, clean movement, patinated dial with no damage, center second, crown marked (Omega, but not the original one for this watch model), one piece leather strap natural, special military model, marked buckle.

The watch is in working condition, +1 - +2 min / 48h.

What do you think, except for the crown, is it a good original watch? Is the case stainless steel and gold filled?
Is the seconds hand original? Is the movement corresponding to the case style? Checked and the movements seems to be from 1944

Thank you
Nic

Here are two more images.

And it's a 35mm, not jumbo

Hello Florin, welcome to the forum.

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