The care sheet
The whole document, no excerpts. It fits on one page because most care is one page long.
Level. The shelf matters more than the room. A model that is a half degree out of level beats differently within the hour and wears unevenly within the year. Use the brass level in the crate; it is cut for your base.
Dry. Ordinary rooms are fine. Kitchens and bathrooms are not. Brass tolerates a lot and hates condensation.
Wind. Once a fortnight, slowly, with the house key. The left-hand square will not accept any other, and that is the design working. Stop when the fusee is full; you will feel it before you hear it.
Listen. The beat is roughly three to the second on most patterns. If it changes, note the date and write to the house. The log card in your crate tells you what the beat sounded like the day it left.
Touch. Dust with the dry brush, never a cloth on the ring set. The lacquer warms with handling and the fingers of the maker who packed it are the last you should add for a decade.
Serve. Every twenty years, a full service with the house. The queue is shorter than you fear and the log books remember your instrument by name.