Hello Si, nice to have you here.
First of all I am so sorry to hear of your stroke.
It's incredibly frustrating to not be able to play your guitar. The brain knows what to do but the body just won't cooperate!
I had one in 2011 and it turned my left hand fingers basically into flippers. Couldn't even play a first position D chord fer Pete's sake!
But the good news is, over time, and with a bit of determination, it does return. Mostly.
So hang in there my friend, don't give up.
Now, as to your guitar. . . a bit of head scratcher that.
On first look it does appear that it could be a Mats guitar.
The trouble is, if it is in fact a Mats guitar, the serial number puts it at a May 1981 build and you say you bought it in 1978! So something ain't right!
On that basis it could not be a Mats made instrument.
The original Di Marzio pup is definitely a late 70's marker and found on a lot of "white label" brands of the time such as el Degas for example. If you happen to still have the original pots and wiring you may be able to get a date code from them??
That's all I got!
