The windings also can be aluminum. Check the nameplate closely, sometimes it tells you there. The nameplate will also tell you the age...I'm not sure when they started to be concerned with PCB's but I believe if it was built in the 1990's or newer you should be ok.
The issue of PCB in the oil is the biggest concern. Don't even consider buying it without a recent certificate of testing, no matter what age it is.
Sometimes these can be sold to people who buy and sell used transformers, rather than just scrapping it out. That is, better than scrap value!
Jon.
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