The Story of the Amulet (1906)

E. Nesbit's 1906 novel, the last of the Psammead books, sends Cyril, Anthea, Robert and Jane through time in search of the missing half of an Egyptian amulet. The contents of their pockets, a fragment of a Waterbury watch included, go with them. (Wikipedia)

Watches

Waterbury watch: The children offer a fragment of Robert's dismantled Waterbury watch to their hosts in ancient Egypt, along with tape, sealing wax and roses. The headman receives the watch fragment with awe. The maker is named, but no model is specified.

Source text: part of the Waterbury watch that Robert had not been able to help taking to pieces at Christmas and had never had time to rearrange. (E. Nesbit, The Story of the Amulet, chapter 5, "The Fight in the Village"; Project Gutenberg transcription)