It's definately not a PC4 - they're visibly distinctive from this model.
Anyways, it's been claimed.
I know there
were several models of this item. However, this unit has no
specification, ie PC-4, so I am assuming it's the first model in this
product line. The catalogue number is 26-3501, if that helps...
26-3501? I thought it was 26-3250 or some such -- there's actually two
kinds of PC-4 with slightly different BASICs.