I purchased this set of signals from PLD earlier this year when they came down from service at Southfield and Lyndon. They were in extremely bad shape, with tons of corrosion and dated back to the late 1950s according to the make/model:
Attachment 10416
Attachment 10417
A little sandblasting, JB weld was necessary:
Attachment 10418
Finished and functioning!
Attachment 10419