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Calculators: Decimo
Decimo was a UK calculator and office equipment company.  They produced many variations of their confusing 1970's Vatman range. See also Strand.

Vatman Super Vatman Super Vatman M

This range has the on/off switch on the front

Vatman
Large name
Super Vatman
(type I)
Super Vatman M
Vatman Executive super vatman

super vatman II

SSII Vatman Vatman X Whilst this range has the on/off switch on the top edge of the case.
Vatman  
Small name
Vatman Executive
1976
Super Vatman (type II)
1975
Super Vatman II
1976
Super Vatman SSII
1976
Vatman
1975
Vatman X
1975
memory man Vatman Mini Vatman Mini M Vatman Mini MII 2001-e Vatman Vantage
Memory Man
1975
Vatman Mini
1976
Vatman Mini M
1976
Vatman Mini MII
2001-e
1975
Vatman Vantage
1975
Super Vatman Office Vatman 120D Desk Mate 12DM
Super Vatman Office
1979
Vatman 120D
Vatman Desk Mate
1977