Vintage Calculators

My first mechanical calculator

My first electronic calculator

Early programmable calculator (TI SR56)Late hand driven mechanical calculator (Brunsviga 13RM)
Currently in repair

Recently added calculators

Last update

It all started with this little programmable SR56 calculator.  I bought it in 1976, build a small program for it and became a Philips software engineer one year later.

In 2013 I was cleaning my attic and found it.  The first idea was to sell it.

I didn’t …………

Looking on the internet what would be a reasonable selling price for the SR56 I ran into the above  small mechanical calculator.

What I found regarding this and other machines was very interesting.  So, I bought it ..... and another one and a more complex one …………

Late mechanical calculator (Friden SBT10)

How Semiconductors Changed The World

About 1970 the world of calculating machines rapidly changed from mechanical

 to electronic.  Using a slide rule  most of the time and electronic calculators not being allowed at school, I wasn’t aware at all of the changes that took place.

Now I consider it my mission to setup a small collection of well preserved and operational calculators which are representative for the changes that took place in that period.


Added internal photo's of the Brunsviga 13RM


Added Olympia AE-D1  and

 Facit 1140


Added Casio fx-68

Update history

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Next months will be devoted to maintenance.  The collection I built isn’t large, but all calculators were fully operational at some point and that’s the way I would like to keep them. Machines that were repaired several years ago might be blocked again and need some further cleaning and lubrication to remain operational.  

The electronic calculators provided with rechargeable batteries are checked every few months. They are all equipped with modern low self-discharging batteries.  An occasional recharge is sufficient to keep them operational.

Citizen MB-280

Citizen MB-280

Olympia AE-D1

Olympia AE-D1

Casio FX-68

Casio fx-68

Facit 1140

Fracit 1140