[Help dating KLH Legend Model 1400s?]

Thanks a lot! I appreciate the info.
I mainly wanted to know how low-power an amp I could get away with to drive them.
 

[Help dating KLH Legend Model 1400s?]

Thank you! How did you find out? It's been pretty tough for me to find ANY info on these things...can't even find more specs. Trying to see what type of amp I should use them with.

[Help dating KLH Legend Model 1400s?]

Hi everyone! Currently looking to upgrade my audio set up, as I've been listening to my records through an old PA speaker. I found 2 pairs of speakers at a nearby flea market. One of which is a pair of KLH Legend Series 1400s. I'm trying to figure out when they were made so I can research them more and see how much I should offer him. Not sure if this is the serial but here's a pic of the only numbers I saw on the outside. 

He's asking 150 for the pair, but I have a feeling that's too much, especially since they've been sitting outside (although under an awning) all week. How old are these and how much should I pay for them? Thanks!