I'll take a bit of a liberty in defining "other" things we collect. That is, other than watches. A collection I would define as more than one, but as many as you like. I have a small (two) collection of marine chronometers. May I take a tiny liberty, and show them?
The larger chronometer is a Hamilton model 21, 14-jewels, one diamond end stone in the balance cock, free sprung, helical hairspring, fusee, Earnshaw (spring detent) escapement, 52-hour run time, up/down wind indicator, key wound and set, finished September, 1944. One of about 15,500 produced. In October of 1944, Hamilton produced more than 600 model 21s. I don't know of another marine chronometer maker who can match the quantity. Patterned after a Negus chronometer. Produced between 1943 and circa 1969. Mahogany cases by the Heintzman Piano company of New York.
The smaller one is a Hamilton model 22, torpedo boat chronometer. But also used by merchant marine, coastal patrol, and numerous branches of the Navy. It is lever escapement, stem wound, stem set, 21-jewels, 52-hour run time, up/down wind indicator. On this one, I don't know how many were made, or when this one was made.