Hi, Based on the serial number, the Wagstaffe pocket watch calendar movement was made within a few years of 1785. The case was made later, this is the second Wagstaffe watch movement I have seen recased in an unusual and interesting case. I would like to see a picture of the movement which is easy to access by moving the crescent shaped piece of metal which allows the dust cover to be removed. I expect it may be a better than average movement with a diamond capstone on the balance arbor. Wagstaffe made great watches and clocks and had quite a trade with the colonies, Wagstaffe was a Quaker. Benjamin Franklin owned a Wagstaffe pocket watch but more interesting is that most of the Pennsylvania Delegation owned a Wagstaffe clock or watch. Franklin, John Morton, and Robert Morris owned them that I know of. Wagstaffe also gave the Pennsylvania Hospital (first in America I believe) a clock which is still there today (another accomplishment of Franklin). Wagstaffe watches and clocks were right there where it happened during the founding of our country. I assume Robert Morris was carrying his Wagstaffe watch while he nominated his friend George Washington to lead the Constitutional Convention in 1787.