mgolab, here is another hatchet thread
http://www.vikingsword.com/vb/showthread.php?t=28106
Ater post #31 it deals with spiked hatchets, boarding hatchets and hatchets for retrieving beaver traps. I posted on that thread old catalogue pictures from archive.org. I would take a look there and see if you find information on the model and purpose of your hatchet.