Sinclair ZX81 ZX 16K Ram

Brand: Sinclair Research Ltd.
Model: ZX 16K Ram
Country of origin: United Kingdom
Price in UK: £49.95
Price in US: $99.95
Price in NL: ƒ 295,-
Price in Fr: 360 F

The ZX 16K Ram pack worked on both the ZX80 and ZX81, hence the omission of either computer model in the product name, but simply “ZX” instead.