The "vintage" Police Stainless (which are the only Spyderco S/S knives that I own) hold their value very well compared w/the modern versions, selling for about the same price between $100-200 on eBay (and Arizona Custom) based on rarity, value and the depth of the pocketbook of the buyer.
The vintage versions (if in good condition) are just as good (in terms of function and design) as as the modern versions and do NOT generally demand a "premium" as a collectable, which is a plus IMO, since I bought the 3 that I was as "collectibles" for around $150 each and I find the appearance of the "hole free" vintage stainless models much more attractive than the modern versions w/clip screw and lanyard holes.
The s/s Spydercos that are scratched are also very easy to repolish them w/a bench buffer, which I did to the PS bladed s/s Police below (the only 1 w/o the original clear protector, which now looks like new.
I'm still trying to find another PE bladed s/s Police to match (in terms of markings) the PS and SE versions below it in VG10. If anyone has one that they want to sell, please let me know. Vintage PE s/s Police folders are the hardest to find.