I have one and have been burning it for about 30 years. It is a fantastic stove. I am looking to buy one in excellent condition since mine is getting old. I burn about two tins of nut coal a year, which is readily available here in Rhode Island. Mine is in my kitchen area, and during the winter it is always burning. Jotul made a great stove with this model and I cannot understand why they stopped making them. I missed one onebay that was never fired. The auction ended the day before I saw it. Yes, you can burn wood in it, but the wood has to be cut in short lengths. Not really a good wood stove, but a great coal stove. Good luck with it.
Top door is where you put coal in. Middle door has a cast iron removable barrier that keeps the coal in, but can be lifted out to empty clinkers. bottom door is access to empty ash pan.
Good luck with your 507.
Very popular in the 70's and 80's there is many brands of smaller hand fired coal stoves from many European countries. These can also date back to the turn of the last century. Imported stoves would include such brands as Franco Belge, Saey and Efel among many others.