Thinking back to rat fur, a lot of the great brands (SWR, Eden) had them but I don't recall Ampeg or GK debasing themselves to doing that. Did I remember this correctly?
Analogeezer
I had a 115 cab from GK in the mid 80s that was covered in rat fur. I can't find a picture of it but it was this same cab (mine was not so ratty looking):
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A few years back I donated it along with a 200W head to a local music program. Probably still going strong!