Decimo Strand Memory for W.H. Smith

3v (2x AA batteries).

Display is 8 digits, green vacuum fluorescent.

4 functions, %, memory, square root.

Integrated circuit: NEC uPD278C.

78 x 136 x 26 mm. (3" x 5.4" x 1").

Made in Japan.

The label on the rear says "Supplied exclusively to W.H. Smith by Decimo".
W.H. Smith is a British chain of newsagent, book, stationery, and music stores.

Note that this model is identical except labelling to the Decimo Strand Memory version.