It was this one. The seller claims the shell was molded in red. What caught my attention at the time was the little æ symbol next to the power plug. I have one in black with the very same symbol, but it was painted (which makes me suspect the red mac is painted, not molded.) I recall seeing another one in some other colour with the very same symbol some years back.
The unit I have has a very interesting Dove simm expander installed; it is in itself a 256k simm, but has a 30pin simm socket onboard to piggyback old 256k simm with. With four of these Dove simms fitted with old 256k simms expands the RAM to 2MB total (the resistor for 256k simm is left intact on the logic board.)