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Don,

The Greenberg's Guide to American Flyer Wide Gauge, includes the prewar accessories at the rear of the guide. 

The 2116 was cataloged between 1928 and 1939.  The 4116 (same item but coming with wide gauge track connection) was cataloged between 1928 and 1936.  From 1922-1927 the 2016 was cataloged, which was roughly the same, but there was no riser between the base and the post.

Your 2116 would fall in the dates of 1928-1935, because in 1936 the item's design changes to having a rectangular base. 

Here is a 2016 c. 1922-1927

Here is a 4116 with its original box

There is also a version with a green post

There are different bell mechanism designs

Here is a photo of the 1935-1939 version

NWL