I've been shopping for a vintage triple crankset for a while and today I was very exited to find a shimano triple road crankset at a second hand bike store for 40$. I wasn't sure what model they were so I looked it up and found this excellent german website that lists many codes. Turns out they are the rare shimano 600 triple cranks! Hope someone else finds this website as helpful!

http://www.fa-technik.adfc.de/Herste...Gruppen80.html