Hi Chuck,
if you are a really brave man, you could take the top off and have a look. The primary should be easy to recognise because the leads will go to the mains input plug. if there is another tag, measure the resistance between the 3 tags. if one value is about half the value of the total, existing wires, this must be the 110 v tag?

I know this measurement will be influenced by inductance etc and is not precise, but I too find it difficult to believe they would build with different transformers for different markets.

but this is NOT something I would recommend, if you are in your guarantee period, or if you do not want the possibility of a mini mushroom cloud when you switch on !