Details as per Standard Catalog :
There are three types of the crown, which is on the obverse at the top. These are shown below and are designated as (RC) Round Crown, (HC) High Crown, and (FC) Flat Crown. Calcutta Mint issues have no mint mark. The issues from the other mints have the mint mark below the date as following: Lahore, raised “L”; Pretoria, small round dot; Mumbai (Bombay), diamond dot or “large” round dot. On the Mumbai (Bombay) issues dated 1944 the mint mark appears to be a large dot over a diamond.
Image of Reverse : Wreath surrounds center hole
Different Year and mints coin :
