That just tells you that the image has been scanned 1:1 and is un-scaled as it appears in the document.

It doesn't mean that the file contains any meaningful information relating to the shapes you want cutting out. But hey, maybe the machine shop is quite used to being sent this kind of document and someone there will be happy to draw around the picture for you. It's entirely possible. I often have to trace vague scanned shapes. It's a way of doing it, I guess - trouble is that you're leaving it open for the third party to make assumptions on. Personally I'd always want to send something as unambiguous as possible.

Wal.