Urgent info request: lanyard button spec?

Hi everybody, long time no me (the day-job is hitting very hard at the moment…)

Anyway, back to the urgent matter in hand: I may need to improvise a lanyard button for a Cadet. Can anyone please confirm the size/diameter of the small black bakelite RAF button that’s stitched to the jumper.

Much obliged to anyone that can provide the required gen. And hopefully I’ll be able to reappear properly on the forum one of these days (if there literally is anything left of me).

Tally ho(pefully)


Approx. 16/17mm diameter.

Wilf, I have spares if you want one.