I have several chromonicas from the 50s/60s, and none seem to be 'standard'. There is only the one C/B hole in each octave, whereas it appears that standard includes two C holes (in a C instrument) next to each other. So it's blow/draw for C/D E/F G/A, and draw/blow for B/C.
They aren't be-bop or blues. classical, solo or minor tuned, and certainly not Richter, so what are they?
There's one which plays in C# when the button's out, and C when pushed in. It's stamped C, and may be 'Irish tuning', but with some delving, Irish tuned harmonicas drop from C to B when the button is used, so it maybe isn't that.
Using an interesting harminoca tag...
EDIT I just can't believe it ! I checked again, and yes, it has two C notes in holes adjacent to each other! Been playing on and off for a very long time, and honestly thought there was only the one C. Perhaps as a kid I automatically by-passed the 'other C' each time, so didn't actively think it existed. Sorry to cause any confusion - I guess the question is now null and void - except for the backwards harmonica.
Not a complete idiot - I just help them out when they're short...