Actually, wouldn't that a good opportunity to use a decent font instead? ;-)

SCNR, Andreas
(checked +500 handwriting and brush fonts at dafont. Doesn't look like a pay font to me, at least not a font I would pay for)

I used this font on a job last year

Do you have a PDF?

It's one small part of a design, but the customer wants a new version, different writing but the exact same font.

Normally I keep a live version of any text outside the artboard, but somehow in this case I did not. I still have the original .ai

When I inherited this work-station, there were over four thousand fonts activated- over the last year, I've been trying to get rid of as many as I can. (the previous user installed most of dafont's inventory, and years of other free fonts, on top of an ancient copy of Adobe font folio and a bitstream collection). Somewhere I have a backup of all of these fonts, but I've already gone through about two thouand of them, without any luck.

That would make waaay more than 4.000 fonts. Even Dafont seems to have dropped that ugly beast. Do you think your customer would notice if you used something similar?

I put your image through WhatTheFont and it spit out these similar fonts:

CCWall Scrawler (Bold Italic, Italic)
GFY Uncle Junior
Buffalo Joe
Flavor (Medium)

Flavor at medium weight looks to be the closest match to your font, though it has a cleaner, more professional feel.

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4,000+ fonts, good god. I have just over 1,300 and it's already tough wading through it all.