W. Collath drilling in 16/65(stamped as 16) and 9,3x82R SN 16689
http://egun.de/market/item.php?id=5405242

Drilling in 16/65 and 8x57IR SN 1008
on the barrels "Walther Gewehrfabrik" and "Heidersbach R/Suhl" so it this was made later because of now unknown reasons for this Collath Drilling in Suhl.
http://egun.de/market/item.php?id=5393785

kuduae hat some possible names
Suhl-Heidersbach, Hauptstraße 12. Walther, Ferdinand.
Suhl-Heidersbach. Inhaber: Walther, Erich. Jagdwaffenfabrikation.
Suhl-Heidersbach, Eckstraße 19. Walther, Max Rudolf. Gewehrfabrik.

to mention only the Walther living in Suhl Heidersbach