Only around 300 of these First Model rifles were manufactured by Parry W. Porter. They are most readily identifiable from the later models by the shape of the primer magazine. It has an off-set blade front sight, rear sight base, "ADDRESS/P.W. PORTER/NEW-YORK" and "P.W. PORTER'S/PATENT/1851." on the upper right barrel flat, "215" on various components, and a smooth buttstock with crescent rifle buttplate. Includes a notarized letter indicating the rifle was given to Charles Lyman Brown (1869-1950/51) by a friend during his adult life, possible as a payment for an engineering project.