I thought it said B.
I suspect tandem is wrong, but it's a minor mistake.I thought it said B.
A mystery........Tandem lists the R at 110, that one says R 100?
identification guide to Lionel electric toy train transformers, with arrangement by wattage that Lionel made during the Post-war periodwww.tandem-associates.com
I guess he can put a date on his now. Thanks, mystery solved.From Tandem's website:
Variation A: Shows power output as 100 Watts. 1946 Production.
Variation B: Shows power output as 110 Watts, it came with an instruction sheet that was dated 6-47. 1947 Production.