That is a beautiful dulcimer. Best of luck finding out more about it.

Ah, now we can see!  Thanks Lisa.  Nice workmanship on this elliptical.  John's right, not a Tignor, but perhaps "in that vein".  Multi-piece tuning head similar to the ones I make, and it does look like Oak.  Tuniing pegs appear to imitate commercial violin/viola pegs.  No idea who/what HRC designates; most builders sign their whole name.  Is there other writing in the other sound holes?

I have not seen such a dulcimer before.  It looks homemade, maybe of oak.  I'm not familiar with the "HRC" designation.  It's not TOO old, because the frets are made of guitar fretwire.  The late John Tignor used the trefoil hole pattern, but I'm sure it's not one of his.

I reduced the size of all the photos to a width of about 500 px.

Beautiful dulcimer!  I would call its shape elliptical rather than teardrop. Is it made of oak, perhaps? 
I cannot venture who the HRC may be...anyone? I would think that without a known maker and with no cracks or other problems, it might sell somewhere between $250-$500. Sorry that's a wide price range, but you never know who might want to buy it and what their idea of 'too much' is these days. If you decide to try to sell it here on FOTMD, you'd have to create a new thread in our For Sale forum and follow the posting rules there.
Do you have no interest in learning to play?

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Sorry -- your images are so large they are more or less not usable.   Probably best to Attach the files than embed them in the text message.

Just wondering if anyone has ideas on the age, where it may have originated, and it’s worth. I found this at my mom’s house and have no idea how long she had it or where she bought it. It has HRC inside the left spade/clover.