Going to be impossible to confirm, but it definitely doesn't look like a Brooks. Brooks never had a label with that shape and size. I've also never seen a cross zip of theirs that had snaps on the inside for a collar and the zippers and chest pocket placement are all wrong for a Brooks. To me it looks like the second HD jacket I posted, but very possible that I'm wrong.
No, you're definitely right about the label that's on the jacket, no doub it's a Harley Davidson (and later AMF) cross zip but I'm just saying that I think that Brooks used to produce these for HD.