"Our Secretary writes: 

These are the jewels belonging to Saint John's Lodge and are as follows:

 
A    Unknown purpose
B    50 years jubilee jewel
C    Centenary jewel
D    Past Master's jewel
 
Item A is intriguing as it is specific to our Lodge but we are not aware of its intended purpose. A suggestion is that it could have been for 75 years. but it does not bear an inscription.
If there is anyone who can help us with solving this mystery then it would be much appreciated. Kindly email me  The Secratary