I think the British enjoyed confusing we Colonials. Your directory suggests that the LC was used only after 1925.
The Betts date code looks to be 'O' for 1934-35
Your Cashmore would be 1896-1904 with the 1 1/4 OZ. MAX
M
A 1887 - 1896 Cashmore for 3 1/4" cases marked 12 over C.
