LISA / Great Little Machine prototype logic board?

Discovered this in my museum clean up today. Definitely not a standard board. Extra pins available for the GLM board and completely differed layout for the ports on the rear. Part number newer than Lisa shipping board. I’m at a loss. Anyone?

It turns out this may just be a 2/10 XL logic board, with an early mouse connector from a 1/ 2/5 - I’d never noticed this before. Same as I didn’t notice that they’d extended out the slots on the board to be potentially up to 72 pins - the Lisa only ever used 56- the GLM had 64