@ADCX Rob, from the schematics @Susan Deats supplied, the adjusting screw was still there but it appeared to have corroded. Half of the circuit breaker was missing, there was a hole where it was. It just looked to be in bad shape. I had no recollection of owning or buying it or even using it. I'm guessing my dad got it from some friend and just added it to the box, he was a bit of a hoarder. When I resurrected the collection in the mid 80s after 20 years, I did buy a new Lionel transformer at the time, can't remember the number. So, with that one, a working 1033, and a newly refurbished ZW, I have all I need.
There aren't many train meets in Houston that I'm aware of, so I have no chance to sell or trade it.