Given the focus on small Bing clockwork you might want to consider adding this Bing set to the collection
This Bing set was sold under the VEDES label. VEDES is short for Vereinigung Deutscher
Spielwarenhändler. Which is a trade organization that specializes in sales to the leisure and hobby market – literally “play and leisure.” The organization was founded in 1904 in Leipzig and moved its main headquarters to Nürnberger in 1929. They took the name “VEDES” in 1920 and their first trademark was a Christmas tree with 3 candles and the name “VEDES” at the base – this is the trademark on the box lid of this train set.