Can anybody identify the logo on the sticker or perhaps the "Pro 55" model?

The sticker does not belong to the P50 speaker, that much is clear.

I have not been able to find out anything from Google searches.

Backstory: I recently took them out of storage, because I was adding glue to the woofer magnets (for safety so that they won't shift) of a pair of S45'2 and wanted to do the same to P50s woofers, now that the glue was already open.

I had forgotten about the sticker, but I clearly remember the guy, I bought the P50s of.

He was a bit odd (to say the least) and claimed the speakers were a special Pro edition and that you also could tell by the black cabinet (I guess it was paintet a some time by someone who did not know better).

The price was right, so I did not discuss the fact/fiction aspect of the story and since all woofers were in working order, I could always use them as spares if all else failed.

I'm quite curious about the logo on the sticker and I hope somebody can help me find out more.

Thanks,
Jesper...