Hello, I give percussion lessons at a middle school that is looking to sell a Slingerland kit. I know very little about these drums. Each shell is stamped with a P inside and they appear to be 3-ply shells. The serial numbers are...

Kick-116527, Tom 117797, Floor Tom 117681, Snare 118672. There is an additional floor tom but I have not seen it yet. The tom and kick sizes appear to be 12, 14, 16, 20. Someone wrote '78 on the inside of the shells which I believe to be the year they were received by the school. I did some checking and the serial numbers indicate that could be the year they were manufactured. All of the hardware on the drums appears original except possibly the snare strainer.

My questions are, what model is this kit? What is an approximate price range? I understand it's very hard to gauge price without photos so I may be able to add pics in a few days. The drums are not in the best shape since they have been played/used by 6-8th grades students for over 20 years.

Thanks for any help I can get....