You can have a metal stamp made it's a pretty common item to have done
I think Centaur forge still offers the service. These stamps are
applied to the steel cold so you would want them back fronm the
hardened parts anyway
On many antique tools I service for timber framers I found it was
common to put a makers mark at the end of the good inlaid steel or the
end of the heat treated zone.
You could also acid etch with a rubber stamp and either apply mask
with the stamp or etchant with the stamp. But keep the acid mix away
from your shop proper because the fumes make things rust.
Get real fancy and engrave a signature.
If you are selling at the high end of the market, the method I used
might be of interest to make a most ellegant mark.
Back in the early 60's when I was a grad student, we wanted an
different birthday present for my mother in law but had the usual grad
student bugetary constraints. We bought a pair of quality sewing
dismanteled them and coated one blade with Kodak photo resist. I then
carefully placed the word MOR (Danish for mother) on the dried KPR with
Letraset, exposed this to UV for several minutes and developed the image
KPR Developer. I then placed a little puddle of Ferric Chloride
(printed circuit board etch - Radio Shack have it) on the area and let
for a few minutes. I then rinsed it thouroughly with water and Gold
through the resist. I built up my own brush plating setup but today you
buy the stuff from http://www.caswellplating.com/nsindex.htm The result
word MOR inlaided in Gold on the stainless steel blade.
She had those scissors 'til she died and my wife inherited them - none
family would DARE walk off with them!
Modifying the above to use one of the newer resisits and electro-etching
before the gold plate might make things easier. I haven't tried that
yet. Very little gold is used so cost shouldn't be a significant
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