not really a collectible..yet.
Probably early to mid 90's (which sadly is getting to be vintage, how time has flown by!)
They were massed produced, readily available everywhere, but they are quite nice drums. My old music store use to sell a lot of them, they were great, and at one time we could sell them at MSRP.
It is true that they are undersized drums, but they are quality drums, and in my opinion are near the spectrum of high end drums. Their finishes were top notch and the tone you'd get from them are great.
Just throwing a number, a used shell pack including snare if it was selling at a music store might sell for $550-$750 in this economy...
I dont recall what we use to sell them for new.