I had also noticed that on eBay and thought the same thing about the "2" and the "A"s. I'm not totally sure, but I did find some other examples with the same style of numerals. They all seem to show the "2" just a little higher than the "1", but not as much as this watch.
https://omegaforums.net/threads/vintage-omega-seamaster-sub-seconds-info.31772/
https://www.ebay.com/itm/1950s-Vint...850150?hash=item3628639a26:g:-14AAOSwUchaPXxk
https://corrvintagewatches.com/product/woo-single-2/