There is no lettering on the underside of the caboose. I have the box, it says Williams Electric Trains, on the bottom it says "Williams Reproductions LTD. 6560 Dobbin Road Columbia, Maryland 21045". On the front it says "Williams Electric Trains, Complete ready-to-run! "O" & "O27" Gauge Electric Trains".
Thanks for the help.

How or where do I find the build date for my Williams Caboose 477618? Road name: Pennsylvania RR, Eastern Division. Thanks