Ok, I have a meager collection of old Wade and Butcher razors. I notice that there are subtle differences in the trademark, namely the number of fletchings on the arrow. I have razors with four, five and six fletchings. could this be a rudimentary way of differentiating the year of mfg, or model quality? also there is a difference in the tang markings, namely the presence or absence of "manufactured by" and also whether straight across or in an arc. Again are there any definitve works that document this, or has this information been lost to time?