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It’s a brand to be burned into a guitar headstock
Brass wouldn't be my first choice for a brand, but then again branding wouldn't be my first choice if I was only going to mark one thing, now that lasers exist. If you're set on branding because it is a slightly different look and feel from laser marking, a specialist brand maker is probably going to be more economical than a generalist CNC shop, e.g. $85 for a 1"×2" brand:
https://www.makersmarkbranding.com/product/flame-heated-branding-iron-standard-useThat's a complete tool ready to use, so all the image format conversion, 2D to 3D design, CAM programming, handle making and assembly included. At a general CNC shop, you'll have burned through £100 before a spindle has turned, and you'll either have to get a second rate brass product or suck up a significant PITA premium for copper because not many people have their tooling, feeds and speeds dialled in for that unless they do habitually do electrode work.
It’s a brand to be burned into a guitar headstock. The design is being done by @amey and should be something like this.
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