Dave, I am the farthest thing from an expert on this forum, but I have dug a lot of axes. The one you picture does have some characteristics of Civil War period axes, but it struck me as having a bit more exaggerated blade angle and overall thinner appearance than the ones I am familiar with. As with anything, the maker might have been scrimping a bit in quality in the name of a fast buck. The axes I've recovered are more in line with those on the link you provided (great site by the way). Not saying yours is not period, just that I'm not familiar with that exact style