Unknown Slide Rule “A&C”

Data:

• Pocket slide rule with a wooden core and surfaces in Celluloid.
• On the back of the slide there is a logo “A&C”

Questions:

• Maker?
  The pins look like those on a Thornton.
  What about the corrugated wood? Andries de Man
  The scales also seem corrugated? Peter Hopp
  I believe it may have Italian origin, maybe Marcantoni. See www.sliderule.it and sliderulemuseum.com
  Model number 12,5R (size and Rietz model or N for Mannheim) is common in Marcantoni devices. Also typical is the rear window with a 45° cut in upper end.
  Not clear if Marcantoni shared models with Tecnostyl or Filotecnica Salmoiraghi (all in Milan) or dealers. Unfortunately, no wood Marcantoni pocket slide rules found.
  

  	Marcantoni 12,5R
  	Marcantoni 25R
  	Salmoiraghi R52 (25R in reverse)
  	Marcantoni 10NB
  	Marcantoni 12,5NB
  	Marcantoni 15R

  Jose Fernández