Yes, it is an original. As stated it was originally 16” and cut down to 10”.
Utica Cutlery (UC), Utica, NY.
200,000 M1905 bayonets 1942 (It was originally one of these)
880,000 M1 bayonets from 1943 to 1945.
75,000 M1 bayonets (Korean War)
Not a particularly rare variant and in the U.S. worth between $75-$125. There are always plenty of these on eBay.
Source: M1905 bayonet - Antique Outings
Thanks for the quick reply!
The description is accurate.