Definately the ver1 4 slot. Memory card reader would be located on the control panel not on the cab and is the version that is much easier to remove or paint over unlike the big plate that the 2 slots have. Its also got a select button, and the coin door might just have a bracket over it, its tough to tell, giving it a bit of a different shape. The only place it seems to get weird, it has a curved button layout not the straight BCD common to 4 slots, but it can't really be a 1 slot with the select button.
Basically I'd say dedicated but tough to tell which one.