I'm seeing whAt I think are Lancer's caps everywhere now I've got one!
Here's one on eBay without it's insignia but no mention is made of the cap in the listing, so is it a Lancer's?
It's worn by a non-Action Man on an Action Man motorbike, which itself is rather nice.
In another shot the cap is placed with an incomplete Action Man and a uniform.
The Man is armless, the description is capless.
"POLICE MOTORCYCLE & DEAD ARMLESS ACTION MAN 1964 by PALITOY embossed (out of action ie dead ideal for diorama piece) & Action man Cavalry HORSE & unbranded SCOUT CAR & 21st Century American AIRBORNE Paratrooper action figure complete all limbs attached and robust & A small arms kit (MNIB) to construct a machine gun."
A Lancer's cap?
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By way of a postscript, I found a cheapo Action Man clone in a drawer and he kindly modelled my new Lancer's/ Officers cap for me!