Duplex Manual Adding & Subtracting Machine (Addiator by Duplex)

[Paul Perrett]

Hi,

I have inherited this vintage (£-s-d) Manual calculator (see attached photo's) which I find fascinating.

Addition on one side , Subtraction on the other (with a leather cover).

I know nothing about it except that it may date from around the 1920's perhaps even earlier..

Any info including it's possible value would be highy appreciated.

I would be prepared to sell it to a collector if it was worth anything serious. 

I live in Belgium, 

Please reply if you can help.

Thanks a million,

Paul PERRETT

[Andrea Celli]

Hello Paul,

          Addiator was a German company and it was the world leader in the production of "slide adders" like this.

You can find a lot of information here http://www.addiator.de/ or http://www.rechnerlexikon.de/en/artikel/Addiator_Duplex

For current value you could look here
http://www.ebay.de/sch/i.html?_from=R40&_nkw=addiator+duplex&_in_kw=1&_ex_kw=&_sacat=0&LH_Complete=1&_udlo=&_udhi=&_samilow=&_samihi=&_sadis=10&_fpos=&LH_SALE_CURRENCY=0&_sop=12&_dmd=1&_ipg=100

when the price is "green", the machine has been sold.

I hope this can help you, Andrea

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[Paul Perrett]

Thank 

You AnCelli .... This is at least a start!

I had no idea that collecting vintage calculators was such a big thing!
Cheers

Paul

Op zondag 3 augustus 2014 18:07:00 UTC+2 schreef Paul Perrett:

[Paul Perrett]

I've checked out those sites AnCelli suggested, for which again my thanks.

On the ebay site what I noticed was that most if not all pictures showed machines for 'normal' calculation.

Mine is only for £-s-d (Pounds - shilling - pence) does this make it more uniek = valuable.

On the' Addiator.de' site I could find no specific details for this type of machine  date manu / value).

Thanks in advance to anybody who could provide additional info.

Krgds

Paul

Op zondag 3 augustus 2014 18:07:00 UTC+2 schreef Paul Perrett:

Hi,

[GCNige]

Paul,

The £sd machines are for the old British Pounds, Shillings and Pence currency which was in use until 1971.

As you can see from your machine, it was non-decimal and arithmetic with it could be tricky, and so this type of machine was very popular in Britain (much more so than the decimal variety) and they can still be found very commonly.

This type of calculator was introduced by the Frenchman Troncet in 1889.
The Addiator models were introduced in 1920 and were manufactured in Germany. They were one of the most popular calculators of this sort, and the name is often used to refer to the type generally.
They were very popular and many models were manufactured into the 1970s and specialist ones even into the 1980s.

As for value, the best way is to follow eBay.
Try eBay items 131254786902, 141364514800, 231295557402, 231295557402 for similar machines (note that some of these have very high starting prices and are unlikely to sell).
An international search on "addiator" will show up other models from different manufacturers.

Regards,
Nigel T.

[Paul Perrett]

Thanks Nigel T,

All info is welcome , and this info helps.

Cheers.

paul

Op zondag 3 augustus 2014 18:07:00 UTC+2 schreef Paul Perrett:

Hi,