Marc, if you're just looking for a tiny piece of it, like the size of the piece in your picture, go look at DVD or CD cases. Hardshell cases. There are plenty out there that have a very similar pattern on it.
It's actually very similar to the pattern on the superman returns cape. it can be machined with a v-groove bit pretty easily, if you know someone with a cnc router or mill.
I have a couple of large "Fast and Furious" RC cars for parts which have a similar pattern on the undercarriage. Each diamond measures about 3/32, compared to the 1/8 on your sample. I saved this part of the cars specifically for the knurl pattern. You might find the same or a closer pattern on similar products.