The Royal Mint has never produced a Quarter-Sovereign coin until 2009. There has never been a need for a Quarter-Sovereign coin, since the Crown (Five Shillings) did the job and, after decimalisation, the 25 Pence coin to a lesser extent.
You have a contradiction here. Mauser is German, Not British. In 1916, the two were at war. What your rifle is worth will depend on what you have, the condition, and originality. Without a detailed description, can only guess somewhere between $50 and $500. Sorry-
The Royal Mint produced no Crown (Five Shilling) coins from 1903 to 1926 inclusive.
British Togoland was created in 1916.
British Celanese was created in 1916.
Vogue - British magazine - was created in 1916.
British Commonwealth Union was created in 1916.
value will depend on overall condition..........................
British 1916
priceless
1p
Ordinary stamps were 3 cents each in 1916 .
the tank the tank