The original decals were made with Letraset Dry Transfer and the font name is Folio Bold Condensed around 7.6mm (28pt font size in any text editor). Read more here ==>
Letraset Dry Transfer Font - Folio Bold Condensed; at the end of the first post you can find a letraset replica file in PNG format (set to transparency) and if you can print this out on transparent, sticky sheets, then you will have your own 'letraset' decals. You can check out this thread too ==>
All Boba Fett Helmet Decals
By the way, that helmet looks better and better!