Sinclair ZX Spectrum with hard black keys

Brand: Sinclair Research Ltd.
Model: ZX Spectrum
Country of origin: Portugal
Made in: Portugal (Caparica)
Manufacturer: TMX Portugal Lda
First year of production: 1984?

Board design: Richard Altwasser
Software: Steve Vickers (at Nine Tiles Ltd.)
Case design: Rick Dickinson

Dimensions: 233 × 144 × 33 mm (feet adds 2 mm)
Weight: 601 g (Issue 6A)

Only in Portugal some Spectrums were sold with a Filesixty add-on keyboard already installed at the Timex factory, rendering this version not very commonly found.
Filesixty was best known for their cheap ZX81 keyboard overlays.