Type name / number: Walther SRM13
Production / SN: SRM13 58080
Calculating principle: Rocking Segment
Calculating functions: Add, Subtract, automatic Multiply
Input accuracy 11 digits
Calculating accuracy: 13 digits
Extra's: Multiply function (one key and one slider??), R key: Back assignment of results. Two displays one with pos neg indicator.
Fast circle shape printing head.
Designer: ?
Production year: 1958
Case material: Aluminum case and bottom plate.
Weight: 9,7 Kg
External links: http://www.rechenkasten.de/Walther/Company/ http://www.rechnerlexikon.de/upload/5/51/Aufsatz-Walther-Geh%E4useformen-2011-03.pdf

Previous owner: Mr. H.  Haake , Dortmund, Germany
Cosmetic imperfections:
(I accuse no one)
Some minor surface scratches on the paint.
Date of receiving: 2012 - June 24, eBay ; Machine picked up at home of the very sympathetic seller and his wife. Nice conversation and got this as a bonus machine!
Machine story: 2012-09-11
Machine was rather dirty. So the motor (which is a brush type) unmounted and the mechanical part heavily cleaned. The motor separately cleaned with washing petrol.
The brushes exchanged and the radio interference capacitor, who starts to leak chemicals due to the temperature decreasing, removed and replaced by the same type of a spare unit. It is a three capacitor type. One 0,1 uF and two 2500pF. With one common connected to the metal parts of the motor and the 0,1 uF over the motor connectors.

The case inner noise reduction material is completely gone, so removed the remaining's.
Machine again assembled and the calculation test are OK. The multiplication sequence still unclear!

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