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Don't know much about old bayonets but your sounds awfully short for a bayonet particularly as the earlier bayonets up to and including some WWII models were pretty long. Most 1800's bayonets I've seen have blades closer to 16"-20" if not longer.
Might yours have been broken and reprofiled?
Maybe this will help you out a little?
http://arms2armor.com/store/ssbayonets-ss2.html