DTK PIM-TB10-Z 10MHz Turbo XT motherboard with 8 8-bit ISA slots.  See video of it starting up.

Siemens 8088 10MHz CPU.

and 640K RAM.

For more information on this board: https://stason.org/TULARC/pc/motherboards/D/DTK-COMPUTER-INC-8088-PIM-TB10-Z.html

Pickup from Cairnlea (a western suburb of Melbourne) preferred, or I can post at buyer's expense.