For those interested, there's an excellent book on Henry out:
https://www.milsurps.com/showthread.php?t=61433Henry design records exist. In addition there is a fellow on the internet who is trying to compile a list of all serial numbered Henry's to make an interactive world map of some sort:
http://forums.gunboards.com/showthread.php?928073-Alexander-Henry-an-inventory-of-surviving-riflesWe all know that the Henry 7 groove barrel was mated to the Martini action to create the famous British Army Martini-Henry - issued from about 1871 to the advent of the Lee Medford in 1888. However, the above book posits that Henry claimed to have been responsible for the 3 groove rifling in the 1853 Enfield-Musket as well. Not sure this is true:
