Newbie alert....

Is a 1980 300SD a W116? Also, is it always a Turbo or was that an option?

The charity where I work is getting one as a donation, and I'm trying to learn enough that we don't lose out by sending it to dealer auction if it needs to be sold at a collector's site to get the best return.

Any advice regarding resale (where, if inspection is needed, etc) or what to look for would be welcome.