Another poor quality photo (as apologised for elsewhere), but this is a Sinclair ZX80 in the museum’s science collection. I hadn’t realised, or at least given any thought to, that these computers were actually manufactured by Timex in their Dundee factories. Hence why, or at least I assume why, there’s one of these at the National Museum of Scotland.
The computer was manufactured in 1980 and was one of the first computers really designed for the home, with the sales of this and the ZX81 being substantial. The colour ZX81, later better known as the ZX Spectrum, was the first computer that I remember.