dbeck,
I was a bit troubled by Streetdrummer's reply to your question when he said "These did not catch on at all. There were serious design flaws."
It's true that the Skinny drum did not sell well in the 70s and that the threads in the shell which hold the tension rods were prone to stripping. However, Streetdrummer's reply implies that this is not a drum of much value.
Actually, the design is in most other respects is now considered to be innovative and exceptional. These drums have a great sound when properly tuned and are in demand by classical players. (Think Scheherazade). They are on John Aldridge's most collectible snare list in "Vintage Drums" (see page 100).
Yours is gray in color (as opposed to black) and that makes it one of the earliest and rarest models.
If everything is in top notch condition and if it is all original, a Skinney drum will easily sell for $400 to $600. If the threads are stripped, the drum will be difficult to sell. Always keep the tension rods lubricated and start the tension rods with your fingers rather than a drum key for the first few turns.
For more information, see Rob Cook's "The Rogers Book" pages 124 and 195. I hope this helps.
Larry