I got a bit worried because the blade has an unusually strong curve to it that I have seen on a few fakes. In one picture though I can see what is almost certainly the high carbon edge peeking out. I think longer handled ones were generally from the early to mid 19th c. while the shorter handled ones were from about 1880 to 1950. However, that is by no means a rule. This one seems like a later example. I do not think the example shown was used by a regular army though several regular armies used them. I have seen a few with a strong curve like that. Phillip Tom calls them "da pian dao", or "big slicing knife".
Josh
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