Both sets of barrels are now imp cylinder / modified. The prior owner said the Gent he purchased from said the original owner worked at Remington and possibly picked up the case as a salesman sample case ? No way to document that, but the gun did come from that area and it would have been easy to have Remington add a barrel.
The case is interesting as the hardware is stamped Eagle lock company, and here is what I googled:
The Eagle Lock Company (established 1833), was at one time the largest trunk and cabinet lock maker in the world. It was based in Terryville, Connecticut. Eagle Lock was at the forefront of padlock security in its time.
The factory had a manufacturing line of over 2000 different kinds of locks. A sales room was once operated on Chambers Street in New York City. The factory consisted of one main office building, and later in 1889 and 1905, extra work space was added including Two five story buildings on either side of the office. The factory had a boarding house on prospect street for Male employees, that was torn down in the early 1900s.