I think it would depend on the condition. From the pictures I see online this looks like a VERY old model of speaker. If there are no visible scars on the finish and the speakers are in perfect working condition then they could arguably be a nice piece of vintage audio. They could be worth that much.
Hell no. I had them and while they are nice speakers they are not that impressive. Their bass is somehat muddy yet it overpowers their highs and mids. And they do not go very deep. The Bic RTR 1530's hit much cleaner and they are only $114 shipped each. They also have very clear highs and mids along with tight bass like that of a 10" woofer.
I think I paid $399 for a pair of SM-155 when I was in college, 18 years ago. I certainly wouldn't mind getting all of my money out of a pair of speakers after 18 years of use. Maybe I paid $599 for the pair. Either way, sounds like not much of a depreciated price for speakers that old.
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