Re: Trans label

Please help me....
I have a transformer that has a label marked like so:
12V 0V 12V
10A
NO other markings. Is it a 120VA (12VAC @10A) OR 240VA (24VAC @10A)?
Its about 3 1/2" all around and weighs 5 pounds.
I'm guessing its good for 12VAC @ 10 Amps OR 24VAC @5 Amps.
Thank You All!
Dave