1940 1/4 rupee in full silver

This coin is also minted in full silver in 1940 which is a rare coin please add 

Any source for this?

And what is your source?

Till 1939 the ¼ rupees were .917 silver but from 1940 till 1945 they were .500 silver.

The only mention of “full silver” for this coin in particular was some indian coin marketplace which offered no description of what “full silver” meant…