Evening all,

Can someone please explain to me the difference between the various Filarmonicas. I've seen Doble Temple, Novodur and Muletta so far, I'm sure there are others. The thing is, apart from the etchings, they all seem to be roughly the same. The other thing I'd like to know is do the numbers 13 and 14 simply signify the width of the razor? The 14s I've seen all seem to be 1" and the 13s 6/8-7/8.