Not to derail this thread too far, but here is a nice page about Weller guns... 60s is a good guess for a 8200.
My first Weller was given to me by my parents when I was a kid (late 50s)... a 8100 K set. Later (late 60s) it was lost/stolen and I replaced it with a 8200, which I still use on occasion. My favourite soldering tool for most stuff is a WTCPN station, also shown on the page:
http://www.stevenjohnson.com/soldering/weller.htm
jr