Derry & Jones (Frederick Derry & Henry Jones) maker's marks
Compare 1 source-linked mark variant recorded under Derry & Jones (Frederick Derry & Henry Jones). These are reconstructions for comparison, not source photographs or authentication evidence.
The left circular initial, central diamond with ampersand, and right circular initial preserve the three-device order and orientation; the ampersand counter is retained.
Maker labels and date or location statements follow the cited source records. Similar names across source collections have not been merged. Compare the photographed mark and the complete object before relying on a resemblance.