Well, that's
not a
Bose 901 knock-off.
From the photo, it looks like a nice speaker, and you probably got a very good deal.
It's really hard to put a "value" on a used speaker, unless the speaker is very-well known or has a good reputation in the audiophile community. I could be wrong... I haven't actually shopped for used speakers... But, I'd be surprised if you can get much more than $20 for
any "non-famous" used-speaker. The fact that it's difficult to put a value on it means that the buyer has a good chance of getting a bargain, especially if he/she can listen before buying.
If I were going to compare speakers, I'd start with the size of the woofer and the number of drivers. Your's looks like a 2-way speaker with about an 8" woofer? I would compare it to speakers with similar construction. But, that doesn't tell you
anything about the sound, the quality of the components, or the quality of the design and construction.
In general, you can't trust the published specifications. Most speaker manufacturers tend to fudge them a lot! This is especially true for frequency response and power ratings. You see a lot of cheap-little speakers rated at 100 Watts that would probably smoke with 100W... Your speakers would probably smoke with 100W of pink noise too! ...When it says 100W "max", it probably means that you can hit it with 100W for one-microsecond.
P.S.I got an even better deal!

Somebody
gave me a pair of 5-way pioneer speakers with a 15" woofers! (They are now my rear-surround speakers, hanging by chains above/behind my sofa.)