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Reference 2525 (model number).

Serial number indicates production ca 1947.

Value, sentimental only, monetary value nil.

 
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The watch would most likely have originally come on a cord bracelet as it was quite the fashion at the time.
The cord probably wore through and was replaced with the flexi bracelet some time in the 1950s/1960s, these were also quite the fashion.

An example is shown below.

Picture%203218-1.jpg
 
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Thanks, I thought as much.
But still, Im not convinced it was very much like the one in the image you posted.
The one you posted screams cheap and modern and I'd never put such a bracelet on any watch, let alone a Vintage (and what looks like Gold) Omega, as in the image.

The photo I posted was merely an example, and the strap may be modern reproduction, but the shoe string was commonplace for watches of the type you've posted.

 
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Very Good - You did your homework properly this time 😀

The cord would have been very different back then - possibly opaque, natural fibre, although polyester was invented in the 1930s, I doubt Omega (or any of the watches in the images you posted) were using synthetics in their watchstraps.
Besides it being opaque, it would in some case also be made of velvet (luxury items).

You wouldn't be a school teacher or an academic by any chance would you?