Woooh, good ! Blue buttons mouse ?
The NEOS was for the C-64, they probably bought a bunch of those and hand-modified them.
It's very similar in mechanics to the old 1351 C-64 mouse.
I also found this on my travels on the internet:
http://www.tcocd.de/Pictures/Peripheral/Mitsumi/ccmouse.shtmlObviously Mitsumi made the mice, as they were one of the subcontractors for Commodore..
Maybe try emailing Dave Haynie or Bil Herd? Bil's a super nice guy...
Those two guys were not involved with the Amiga at this stage, so they might not have the best knowledge about this era. You want some of those guys whose names are written beneath the top cover of production A1000s.. They were actually there.