I agree with Ramussons, it doesn't look like a 1500W transformer, and with no idea of what rating (or indeed even voltages) it might be it's not a very saleable item.
The physical size is larger than a 1500 microwave oven transformer. I put 6 vac in on 1 winding and wrote down the output voltage on the other windings but have lost my notes. I dont know about other folks but to me the transformer is valuable for a rewind, 200t primary for 120 vac input.