Textured Black Paint: How do I do it?

I'm not sure where to post this question, and I've looked everywhere. I'm refurbishing an amplifier. It's an old B&K with a steel case painted with a textured black paint. Many manufacturers use a similar paint - including REL, Green Mountain Audio (on the Europa), B&K, Parasound, etc. I'm not sure what it's called, but I think Rel calls it "Britix Black".

My question is how can I duplicate it? I called B&K - they just outsource the chassis work, don't know how it's done. I have the spray equipment, but can't find any pre-mixed paint that results in this irregular Texture. Rustoleum sells a texture paint, but it's a finer, more consistent texture than this, and only available in the spray can, so I can't fiddle with the pressure/flow to "coursen it up". I assume there is a chemical that will cause "curdling" of the paint when mixed in.

Can someone help me? thanks in advance!