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I thought they were called "modell 36"...however the Kipplaufer von Sauer & Sohn made in 1936 had a bolstred frame(as I recall).

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Sauer & Sohn, Suhl, made two mdels of Kipplaufbuechsen in the 1930s:
the Modell 36 with a bolstered boxlock action body, Greener or Kersten crossbolt top fastener (depending on chambering), half-octagonal barrel with integral rib.


the economy Modell 37 with simplified action body, just underbolting without any top fastener, round barrel with a soldered on rib.