From https://www.omegawatches.com/en-gb/a...straps/product
"OMEGA's "NATO" straps evolved from the leather and canvas ones used by British pilots, navigators and army personnel during World War Two. For safety reasons, wristwatches did not use removable spring bars to secure their straps. Their fixed bars, often soldered, were less likely to break than spring bars so there was less chance of losing the strap. Of course, this meant that the straps were created in a single piece that slide through the fixed bars."
This appears to be an 1953 Omega "Thin Arrow" British Air Ministry (RAF) issue watch, with unusually dirty numerals on an modern unbranded nato...
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