I believe the Minuteman was the only sidelock, full stocked rifle made by Numrich, all others being underhammer style rifles.
A Shooter's Bible Publication BLACK POWDER GUIDE 1969, by Major George Nonte says of it:
"MINUTEMAN: A traditional style pinned-barrel flintlock Kentucky rifle but not an exact copy of any make. Barrel is 39" long, 15/16 across the flats, available in .36 or .45 caliber with uniform or gain twist. Silver blade front sight, low notched rear. Maple full stock with brass buttplate, patch box, and furniture. Weight in .36 caliber 9 1/2 lbs., .45 caliber, 9 lbs.
The Minuteman is also available in percussion lock form, all other specifications remaining the same. Interestingly, this gun uses the Minuteman Flintlock converted to percussion, just as it was done many years ago."