Being only 36 frames far off is nice, isn't it, considering the 70+ years passed
My frame is 23" but it may look larger because of the optically longer looking headtube, for the clip-on type headset bearing recesses.
Yours do not have recessed headset bearings, does it? I have yet to see any other examples of this frame with recessed headset bearings, though...
I don't plan to give up on a brass headbadge, the common Holdsworth badge the bike came with is broken, though, but replacements are available (either used, NOS or remake copies).
What I'd like to find out, though, whether the De-Luxe badge and the common badge has the same rivet spacing, or not. Fortunately, I know someone who has a Cyclone De-Luxe bike with the De-Luxe badge so I will contact him and revert back with the info here on the forum, too.