Definitely RS series from the mid-late 80's through early 90's... based on the size perspective given in the photo, probably an RS 3000 or RS 4000... either would be worth the money asked, but I might (hope) see a glimmer of an EMIT reflecting through the grille of the right speaker in the photo... if it is, it is an RS 4000 and the tweeters alone are worth twice the price of the pair of speakers. In any case, either is worth the money, and sound good for their size. If not already done, be prepared to spend a few bucks to refoam the woofers and probably mids... cheap if you can DIY, and still makes them a bargain.