Fingers Crossed for 2021 ...

2020 was the worst! COVID kept the museum closed for much of the year and a mains water pipe bursting causing a flood kept us closed for the rest. 
We're hoping to re-open in the next few months ... fingers crossed! Read More >>>

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

Olivetti Summa Prima 20 (pre-decimal)

This mechanical calculator is from the 1960s and dates from pre-decimalisation in 1971.

Manufacturer: Olivetti
Date: Unknown

Other Systems Related To Olivetti Summa Prima 20 (pre-decimal):

Item Manufacturer Date
Olivetti Tetractys 24 Olivetti 1958
Olivetti Elettrosumma 22 Olivetti 1958
Olivetti Summa Prima 20 Olivetti 1966
Olivetti Summa Quanta 20 Olivetti 1972
Olivetti Logos 9 Printing Calculator Olivetti 1981

This exhibit has a reference ID of CH43093. Please quote this reference ID in any communication with the Centre for Computing History.

 

Olivetti Summa Prima 20 (pre-decimal)


Click on the Image(s) For Detail


Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum