OK. You won't find any commercial recordings of the E520. There are none, as far as I know.
Although I wasn't that involved with this model, the E520 is basically a smaller brother of the E550, the first Kawai that I helped design and voice. It dates from 1980, when the organ was unveiled at the Frankfurt Music Fair in March, played by me. Photo of it on www.andrew-gilbert.com
For a Japanese organ of that era, it has a good tone. Nice clean drawbar organ sounds and a real leslie. Strings are good, and I'd shown the factory guys how to set up the ensemble effect by then. Brass is OK, but the piano is a bit thin. Rhythms are very typical of drum boxes of that era, and there's a nice 'wha wha' guitar on the two patterns at the right hand end. 3 channels of amplification give 90 watts, plenty for home use.
Usual high Japanese build quality and reliability, though do bear in mind that it's 28 years old now and spares are not available for most organs that old.
What are they asking for it?
Andy G
It's not what you play, it's not how you play. It's the fact that you're playing that counts.