IF really PC copies of 18th-19th Century knives is important to you, university libraries & "some" museums will either make you Xerox copies of their knives or let you make them.
(Several years ago, a research librarian at DILLARD UNIVERSITY saw me intently looking at & trying, with little success, to sketch some of their daggers, which were displayed as part of their "Early Times in Louisiana" section. I'm FAR from an artist!!! - She asked me what I was doing & when I told her, she said, "Come back tomorrow & I'll have something for you." = She handed me color copies of all the dozen or more knives in the case. - NICE, NICE, HELPFUL lady.)
yours, satx