The seller did refer to it as 22297.3.
This was the description of the watch (and I quote): "It is a 22297.3. 35mm, Cal. 281 just overhauled. Lovely, even patina throughout"...
Regarding the redials. Yes, there are no exact similarities. I guess the point I was making was, while there are numerous differences between all of them, the one thing common to all of them (if we consider all 3 i.e. Richards, the one offered to me by a "reputed seller" and STO, as redials/refurbishments ) is the font of the numerals in the hour chronograph register....).
Anyway, I have hijacked a thread about beautiful Tr-Compax examples with talk of redials, so I will create a separate thread for something else that I've just seen...(or offered)....