WOW! Sorry to post here without intent to buy the item but I've never seen one of these photographed before. I wish you the very best of luck selling this really interesting piece of hardware.
I think the Super CPU go up to 20MHZ making it faster than Amiga 1200 !
I can personally attest for this, C= was huge in Hungary, being a tinkerer nation, but also in Poland, Greece, Germany..It's amazing how so much high end hardware for commodore computers is in Hungary, accelerators especially seem to be available constantly from that country. I guess commodore was big over there.