Bottle, Oil, Mk IV
Finally, in 1906, someone figures out that a flat-bottom oiler will stand up where you put it, instead of falling over. The design will remain unchanged for the next seventy years. This is the most common Lee-Enfield oiler and remained in production at least until the 1950's.
Occasionally one encounters steel or recessed caps on Mk IV oilers. These are Great War (World War One; 1914-1919) economy measures. The steel caps are unique to oilers manufactured by WESTERN ELECTRIC; the recessed caps sometimes show a HARCOURTS patent mark.
Steel caps are a scarce find as many have succumbed to rust.
Assorted markings.