I am the proud new owner of a Diocletian from London with the LON mintmark. This issue was the first struck by the Tetrarchs after the defeat of Allectus. In fact, I bet that this was the actual first one struck.

This is a pretty scarce coin, as of 2024, the authors of
London Mint of Constantius and Constantine (LMCC) knew of only 43 examples. This coin is also from the Rauceby Hoard and is illustrated in the book about the hoard --
Recent Discoveries of Tetrarchic Hoards from Roman Britain and their Wider Context.
Diocletian
A.D. 295-296
AE follis 27mm 9.9g
IMP C DIOCLETIANVS P F AVG; laureate head right.
GENIO POPVLI ROMANI; Genius standing left, naked except for chlamys over left shoulder, holding patera and cornucopiae.
in ex. LON
RIC VI London 1a; LMCC 1.01.001
RHC (Rauceby Hoard Catalogue) pl. 13.1, #4 (this coin)