Some more details:
Which wallet in particular? How much are you offering to pay for the service? Getting it done and in your hands in 7 days is quite tight. Assume that the wallet you want is on Amazon, that’s 2 days at least to get it, then the engrave design process* with a revision or two, then shipping it to you.
It’ll be tough to get it done in your timeframe, I think you’ll need to get the design worked out in the wallet shipping window if you want by the 29th.
*Hard to know how the revision process might go, but it could be like this:
(Let me see the handwriting you have in mind. Oh sorry that doesn’t have enough contrast, can you redo it in black ink on white paper? Oh sorry, the line thickness is too thin, it won’t engrave well, redo it in sharpie please. OK, how big should it be? Oh, sorry, the wallet is only x" wide, your handwritten note is too long to render well at this size. OK, this new version looks good. Now, about that monogram… what font? What sort of decoration? Oh sorry that font isn’t free, do you want to pay for the license? No? OK, then choose a backup font please. Great, looks pretty good so far. OK, so I ran a test and it turned out the settings were wrong. I’ll need to order a new wallet. Oh I got the new wallet, ran the job but now messed up the alignment or there was some other technical issue. I’ll have to order a new wallet… at which point it’s like March 47th and you’re out of luck.)