Dec 17, 2021
what do you mean by exact?
when i tune a harp i set the tuner to A = 443
ive seen a lot appear to be tuned to 442 and some are tuned sharper than 443
the golden melody should be tuned to something like 443 i expect so it will probably appear to be sharp if you are comparing it to a tuner calibrated to a = 440 and if you are playing with light breath
the thing about harmonica tuning is that the reeds respond to breath pressure and they are also susceptible to condensation.
the longer reeds are more susceptible to breath pressure and the shorter reeds are more easily affected by condensation
so generally a harmonica is very carefully tuned to play in tune with itself and to be about 10 - 15 cents sharp of where we expect it to be when its in use.
but factory tuning, who knows. it is mainly done by ear using a master plate as reference i think, at least thats how it was done at hohner