Antique hillside plow?

[CKH52]

Good morning from Vermont. I have what I assume is a two-horse hillside plow that I saved from the recycler about 30 years ago that I'm curious about. There's no specific manufacturer's mark on it, but what appears to be "Patented Sep 27 78" on the spring-load locking yoke and " 2 H N" on the moldboard and "H 2 Y" on the frog. There is little wear evident anywhere and everything moves as it should. I can't seem to find any internet pictures of a mechanism that's quite the same. Does anyone have any idea who might have made it, or its value? Thanks. CKH52

 

[sandman2234]

Good morning, I just thought I would give this thing a bump. It sure looks older than me!
David from jax