BSG.OS.00137 — Not a Seal, Bicycle Valve Dust Caps?

Found in Cambridgeshire.

Dust caps for bicycle tyre valves circa World War 1 - easily mistaken for lead but see below.

From David Lindsey, "I think they're a zinc alloy - quite soft."

Now thought to be more likely from military medicines. GERMAN WWII WEHRMACHT MEDIC OINTMENT TUBE FROM MEDIC BOX LEUKICHTAN War Relic - ebay.?