I would say it is a post-1813 commercial musket. In general configuration it could be a volunteer musket, made for one of the many volunteer companies that were organized during the French invasion scare c.1792-1805 but by the time that musket was made the invasion scare was long over. In an American context, it is representative of the thousands of light muskets that were exported for sale to American militiamen. Sometimes, these were sold in sets of 60 but most appear to have been sold individually.
It is extremely unlikely that it is an officers' musket for two reasons... it doesn't appear to be high enough quality and by 1813 the practice of officers carrying muskets was going, or had gone out of style. The fuzee was primarily a reaction to the problems of fighting in North America. In the British service they were never a "regulation" arm. They were tolerated because they were practical for fighting in heavily wooded regions but in continental fighting much less so... or rather, there was much less need for them.
I've been collecting copies of portraits of officers with fuzees for a long time now and have about 15 of them. The latest is dated around 1792 and I have one fuzee that is dateable to a narrow time frame around 1797 but, other than those, all of the remainder date from about 1760 to 1785.
It is a nice, straightforward, British-made commercial musket. One of those items that many collectors don't see very often because they aren't looking for them. To those that are looking for them, they aren't terribly rare.
