Assorted propelling pencils - grey graphite (Primrose LA1)

I have this collection of old propelling pencils in need of using up, and possibly refilling.

For those of you who have never encountered one of these before, they are refillable lead pencils containing a very thin piece of graphite, and pressing the top button (occasionally side button) propels the graphite forward as it wears down with use.

I have checked that they all still have some usable graphite still in them, though I am not sure how much.

Hopefully somebody out there can make use of them...