Greg: Thanks for adding to the party...that "Monday morning" special is a hoot! OK just to keep the party going, here are a couple of Marx semaphores.
On the left, the Marx 311, likely prewar or possibly both pre and early post war. This is all metal, actuated via a rod linkage to the base just like the AF ones we pictured earlier. Note the blade shape at the end with a "pointing finger" shape. When it is put in the "proceed" position, the red "lens" disappears into a metal envelope at the top and is completely hidden. When "stop" is signaled the green "lens" disappears into a lower metal envelope and is fully hidden. This makes the signal unambiguous even though its not lit. Clever design. Very likely made from the 1930's to 1940's and perhaps again in the 1950's. If it did re-issue post war, it very likely did not last long as plastic was emerging as the key material and that was cheaper and easier to work with.
The one on the right, is a Marx 063 I believe, almost certainly post war, and it has no activation linkage at all you just move the blade with your fingers. It is all plastic , does have the added detail of the ladder and it is much closer to scale size and shape...but it's not tinplate! It may have been sold as a separate piece but was also part of a multi-piece "accessory set" that included other plastic pieces. My guess is that the plastic piece was available from the 1950's through the 1960's.
OK...that about cleans me out of signals ! Happy and healthy weekend everyone.
Don