Frankly, I don't know what percentage it is. Maybe around 50%; maybe more considering he engraved down the back of the grip frame. I think he prices per job.
A couple of area match shooter friends had him do some engraving. One had his S&W M627 match revolver done and we had an revolver engraved to give away at our ICORE regional match. So, of course, I wanted one engraved!
I just told him I wanted some 'old timey' scroll stuff, but not 100% coverage.
I think he gave me a great deal, so I cannot reveal my exact cost. But I think he said my engraving would easily be worth $400 to $500.
Mark's (engraver's) cell phone: 775-343-8022 but sometimes hard to reach. If his cell number doesn't work so good, try: Silver Bullet Gun Works (in Sparks NV) 775-331-8228
Definitely give him a call. You might be surprised.
I know next to nothing about engraving - this is my first - but I'm quite happy with it. If I do another, I think I'll do a stainless steel revolver as the engraving might show up better and won't have to have it re-blued.
The gunsmith that blued my revolver said he thought the engraving quality was very good. What do I know? It looks good to me!!
Mark has engraved knives and other items for quite some time:
http://www.icollector.com/Fine-contemporary-spear-point-knife_i10585864
http://blmaconknives.com/sanfranciscoknives.html