That appears to put 2 sharps on C?

I think I'd assume the standard signature and attribute it to sloppy penmanship. Especially if the score was not at fairly enlarged scale, it can be a little ambiguous where the "center" of the # symbol is.

If it's a fairly old book, prior to photo plate reproduction, the "graver" who laid out the stuff may have been better at scratching lines than at reading music. Sort of like the guy in India who's outsourced to set the type for the Japanese guy's translation to English for the operating manual for the made in Taiwan widget you're trying to assemble for the kid's Xmas present (which of course was designed by an Italian on loan to a French design firm).

Lots of the older scores were set for printing by pasting little dabs of symbol scraps on a "layout sheet," so "alignment errors" of that sort wouldn't be too surprising. Especially if a non-musician was trying to make it look like someone's handwrite.

John