Thanks a lot, Kevin,
yes indeed I have separated the Caithness time Paul Ysart crowd of 5 single harlequins and 3 double storey weights by three main criteria:
a) UV shortwave response of all 8 Caithness PY weights is the same, yellow/green not as strong as Moncrieff, but similar- contrary to the Harland weights (tested 1 double, 6 singles) show only a very weak response, a light pink if any...
b) bottom finish: all of the PY Caithness period are polished flat and show, more or less, a "cord velvet" texture (Harlands finishes are perfectly shiny)
c) the profile- I call Paul's Caithness harlequins (single and double) "thick and squatty", the Harland singles are much flatter, the Harland double has a "bullet shape" similar to the fountains of the same period, diameter slightly more than a single but height is +-3 in.
d) of course- there are canes or twists matching to other PY signed work, and bubble number & arrangement considered
Maybe you misunderstood, my combined picture is showing both doubles of Paul's production at Caithness, the side view is of the 6+1 bubbler, and other details prove it is clearly not from Harland time.
And, of course I know the harlequins from Caithness after Paul has left, (obviously 2 series, one around 1976 and a limited from 1994)- they are mostly CG signed (in some colour/shape variations of signature) and the decorations rest over a translucent underground, mostly blue, brown, purple etc. and contain only few millefiori slices (if any).
Yes it would be most helpful if Sophie could present some of the decoration/cane details, closeup of the bottom finish, sideview of the cave and the bubble tunnels,
best wishes, Erhard