Sweet caboose Jeff. The lamp actually came from a friend of mine. I have no idea where he got it from but if I was to guess I would say Ebay.
I have a couple of Armspear Spheroidal bridge/Pier lamps. One, a swing bridge top lamp identical to the marker lamp seen here except for the marine style of bail (handle) and without the clasp marker mounting bracket. It also has the added (and therefore removable) blinders that reduce the visible segment of the lenses from 90 degrees to 60 degrees as were also found when these had switch lamp bases riveted on to the bottom of this type of lamp. The other is an all aluminum cast electric pier lamp made in the 1930's or 40's. This type of lamp was made from the late teens until at least the mid 1930's.
Google images: "Dewey defeats Truman" and you'll see the famous photos of president Truman holding the newspaper with the incorrect outcome of his presidential election while standing on the rear of the OFFICIAL Presidential observation car AND NOTICE THOSE MARKER LAMPS!!! Paul
