The transformer has 2 primary windings. In parallel they are probably 120V and in series they would do 240V. Looks as though they are wired in parallel so 120V input it is. This is fairly common for multi input voltage transformers.
One thing you could do it rewire it for 240V AC input and connect it to 120V. That would cut your output voltage in half giving you about 54V DC at the cap. The only drawback there is that your available current would also be cut in half.