What kind of harmonica do I have?
 

I am a piano & rhythm guitar player and while I was searching for a lost cable I came upon an old harmonica. I looked on YouTube some lessons, but they had different kinds of harmonicas, and I couldn't find mine.

My harmonica has 48 holes set in 2 rows. Their harmonicas had only 1 row of 10 holes.
I used the piano to identify the key of my harmonica: it's C.
My harmonica is the same width as the ones on YT, but it is longer: if I hold it they way I saw the ones on the internet, I can barely reach the middle of the harmonica (and I have a slightly above-average sized palm).
The harmonica is gray and it says HERO HARMONICA and some Chinese symbols.

Is it a chord harmonica? If so, where can I find lessons for it?

Stevie Wonder would know ;)