Type name / number: Walther Multa 12 (model SM12)
Production / SN: 937325
Calculating principle: Rocking Segment
Calculating functions: Add, Subtract, automatic Multiply
Input accuracy 11 digits
Calculating accuracy: 12 digits
Extra's: automatic Multiply, R key: Back assignment of results, circle shape of the printing head.
Designer:  
Production year: ? (between 1962 and 1975 )
Case material: Aluminum case and bottom plate.
Weight: 10,7 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: Thomas Tohry, Reichenbach, Germany
Cosmetic imperfections:
(I accuse no one)
Hard to find any, a few on the key board plate, Perfect state! Intern as well!
Date of receiving: 2012 - may, eBay
Machine story: 2012-05-10
One digit (the second) was not printed (remains zero). After oiling it, it was fully functional again. First calculating check ok. Automatic multiply works very well. The design, mechanical construction as well as the electrical components and schematics can be considered as very professional. All partly dismantled and proper cleaned.
2012-05-15
The printing mechanism differs from all the others I see so far. (Thypical for the SMxx series. The Multa 32 = SM32 and the SRM13 have the same). It is remarkable fast. The print heads are rounds. On proximity one half of the circle is filled with the stamps 0 - 9 and on the other half are gear teeth. These are via a gear wheel rack connected and forms a rack pinion assembly. So the horizontal rack shift turns the print heads to the figure to print. To establish the printing itself, the digits who take part in it, are moved forward to the paper, a 10mm gap has to bridge. This I had try to make a movie of, with 24 pictures per second. This camera was not able to record this fast moving mechanism properly.

Content without guarantee! (UK); Inhalt Ohne Gewähr! (DL)