The Glythtide's harp appears to be a wind instrument.

You are certain that the Glythtide's harp is crafted from metal.

You are certain that the Glythtide's harp is very finely made.

You are certain that the Glythtide's harp is fitted with a reed.

You are certain that the Glythtide's harp weighs exactly 2 stones.

You are certain that the Glythtide's harp is worth exactly 1250 Kronars.

This has to be an oversight or something. Harps are not wind instruments nor do they have a reed.

It is indeed a harmonica/mouth harp.

Just for reference, here is the recall and look of that particular instrument.

Recall:
The Glythtide's Harp is a free reed instrument played with the mouth. The small reeds are set into a slim case small enough to fit in a vest pocket. For each reed there is a hole through which the harpist draws in air or blows to create sounds on two octaves.

Look from last year: (I don't see anyone currently IG with this years)
Made from polished silver, the top and bottom cover plate of this instrument has been engraved with frolicking donkeys. The comb has been wrought of kokona reed, while the blow reed plate and the draw reed plate have both been made of sturdy bamboo to allow for a delicate but robust sound.

~Evike
Twitter: @EvikeDR