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I believe they're from the same factory, but no way of knowing for sure, I guess.
Perhaps the reason Dengfu don't sell HB086 with the spacer stack design from their HB069 is because that spec. is licensed to PX, PDQ, etc... Oooh speculation!
PX were selling them for £144 (I saw wiv me own eyz) for the first few days of their Fibonacci sale in September/October, before presumably realising their mistake and bumping them back up to something like £233.
Nice to have a warranty anyway.
Yes.
You can also buy them from source to save money.
It's a Dengfu HB086 with the spacer stack from the HB069.
Also very similar to Hongfu HF-HB029.