I am not a cap or uniform guy but the one shown in that ad is quite different from the original one being asked about. Look a the curving of the letters on the one in the ad compared to the straight line lettering of the one on the cap in the original post. Again, I could absolutely be incorrect but I don't like the looks of the original cap posted. To me it looks like something made to look old. Maybe I am just cynical from being on the board too long?
