H stamping on civil war revolvers

[dirty dave]

Can someone tell what or who the H stands for on lots of civil war revolvers?thanks

 

[pohill]

The letters, from what I can gather, are military inspector's markings. Here's a list of the inspectors and what they inspected. I have a Whitney with B, F, I, W that I'm trying to figure out who they belong to.
http://proofhouse.com/cm/us_inspector.htm