1911? L&H say they introduced the model in 1985. http://www.lyonhealy.com/press.htm

There is one for sale in the classifieds here. Yours clearly needs complete restringing and a service.

L&H would confirm the date from the serial number.

They’re nice harps, though, so it seems worth getting it sorted out (re-strung & serviced, as Tacye says), or at least having a professional tell you what would be needed. If it’s playable and hasn’t been damaged in some way, you could then sell it for a decent price. You will want to get someone who knows what they’re doing to look at the levers* to see if they all work properly, and also advise you as to what price to ask. I played one of these when they first came out back in the mid-80s, and liked it a lot.

Even if you don’t care to spend out money getting it done up, it’s as well to at least know what the score is, so you can pass the info on to whoever you sell it to (and adjust the price accordingly). But the LH’s are good-quality – it’s a lovely gift! Good luck

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*Any of you guys recall what levers LH were using back in those days? My best memory-shot is that they were those brass lift-up ones, with the little V -indent that displaced the string outwards instead of to the side as blades did.