Stephane, You will have to judge that for yourself from the photograph and the bow of your own key.
Printable View
Stephane 'old font' style stamps are difficult to find these days, the modern stamps don't have the serifs on the letters making them cleaner but modern looking. Old sets do come up for sale occasionally but they usually fetch high prices as they are sought after.
Attachment 19508
Also, the original makers name wasnt stamped on individually by letter but with a single die cut block like my one here, you could do it with individual letters though, just takes more time and practise to get it all aligned perfect.
Attachment 19509
Regarding antique keyblanks I have hundreds but the ones with Milners style bows are long gone in 7-gauge. Most Milners pin keys were 7-g BSWG from memory, but these left now are too big at 5.5 and 6 gauge.
Attachment 19510
I can't think of anyone having original factory blanks hanging around so silver brazing a Milners bow on a non-plated period key like safeman suggested would probably be the easiest way of making it look authentic.
thanks guys for aid. it seem to be difficult to do something very close to original. i will check for old bump style and try the challenge. i will let you know.