This week, I had repaired 3 similar locos.
The brown is a Bing 11/456 (1927-1929) and the green is a Bub 477L (1936-1937) , which was made with the Bing tools. Both clockwork.
And a Bing 11/883 electic loco. Was made 1928-1932 and has the last Bing motor.
Together with the 11/456 clockwork loco. The 11/883 is much bigger.
Arne