Sinclair Spectrum 48K Old Version

Manufacturer: Sinclair
Model: Spectrum 48K Old Version
Released: ?
Production ends: ?
Processor Z80A, 8 Bit
Mhz: 3,5
RAM: 48 KB
ROM: 16 KB
Operating Systems: Basic (in ROM), Maschincodes
Graphic, Resolution: Graphic: 256x192, Text: 32x24
Colors: 8
Sound: Beep
Ports: 1 HF, 1 RS232, 1 Userport, 1 Tape I/O
Keyboard: 40 Keys, RubberKeys, QWERTY
Internal Drives: -
Specials: Coolingribbs and other Type-Sign
Accessories: ZX Printer, Interface I, Interface II
Launch price: ?
Got own one from: used, DEM 20,-

I don't know more about this Version of the ZX-Spectrum.