
IMO this was originally Oric-1 with 16K RAM later upgraded to 64K - on the bottom side of PCB it's clear visible solder work to replace DRAMs with sockets. But CPU looks very clean and for me it's very plausible that it was on socket from factory.
Having a scheme for versioning will be very good and useful for all!
You're welcome, glad it works! Thanks for the feedback.