I think there is a real issue/emission distinuishing these coins, based on the Allectus-like busts on the early coins.
First we have the LON group, with Allectus style.
Followed by Stewartby 1a (CT 1.02) Allectus style, laureate
Followed by Sewartby IIe (CT 1.03) Allectus style cuiraissed (sometimes draped). These cuirassed busts typically have two rows of a ">>>" chevron pattern on the shoulder, and another running across the top of the cuirass. There's not normally much, if anything, visible of the shoulder ptergues (flaps).
I agree that Adriaan's coin is difficult to place. It does have the chevron pattern on shoulder (only single row), and across top of cuirass, which would support IIe (CT 1.03), but the prominant shoulder ptergues and squarish jaw (vs rounded Allectus style) look later.
The long FL VAL legend also suggests early (CT 1.03), but that's not a slam dunk. Hugh Cloke previously posted this example of the FL VAL legend on a later CT 3.01 specimen.
All told, I'd tend to place it as CT 1.03, based on the chevron-patterned cuirass as much as anything, but it's certainly a bit of an outlier. No doubt Cloke & Toone, having seen more of these, have a better idea of how they cluster.