The data are copied from a data sheet (unfortunately Japanese), which I have as a PDF.
The price is from a thread in the analog forum, was mentioned there by a user, so without guarantee. (relais1 says: "At the end of the 80s, the part actually cost 1000DM on a regular basis. I can still remember it exactly because I was able to get it at a well-known HiFi discounter in Munich for the then discounted price of 800DM").