The old ones are made in Germany or the US and are high quality and somewhat desireable. Keep in mind that $150 is really not alot for a good scope of any vintage.
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I put this Frontier on my Romanian M69 and its a perfect match. Not many companies still make a fixed 4X anymore too, and its a useful all around scoped thats simple and rugged.
4X magnification offers sufficient zoom at short and medium ranges to see and track deer- sized game while still allowing a good field of view for scanning brush and shade.
That redfield looks familiar......
Theres always a market for vintage optics in good condition, for all of the reasons already covered.
Ive made a habit of buying up any cheap, good condition, gloss bodied scopes I see locally. Sometimes without looking to see what they are. Ill then turn around and post the ones i dont think are real cool on ebay. The ones I do think are neat get posted here, or given to friends.
With what Ive gotten for the ebay stuff Ive more than broken even for the stuff Ive sold cheap or given away.
Another thing ill do is pull old scopes off guns I buy. Since Im one of the folks that likes higher magnification and trying new brands of optics.
On a good buy sometimes that "old" scope, will sell for 1/2 or better what i spent on the whole package.
One of the things to watch if you DO play the ebay game, is how many folks are watching your auction, and what have other similar things sold for. Ill usually post a buy it now for about 20% more than what the average sale price is and start about the same low, sometimes you get the guy willing to spend just a bit more cause he got scooped in a lower auction, but with that pricing youll almost always get a sale.
Ive had stuff get relisted for a couple weeks tho.....as Hookeye said, sometimes its just timing. Thats where seeing how many watchers there are makes a difference, if you dont really get any interest you need to check your title, keywords etc, if those are good, it might be best to just sit on that item for a while.