My grandfather got this puzzle in the 1970's.

[JohnDBarrow]

It was from my mother to him as a Christmas present. It had plastic pieces on a peg board with a hard plastic clear case.

Here is that puzzle for you to solve in digital form. Moreover, how many possible solutions are there to this puzzle? 

 

 

Edited August 7 by JohnDBarrow

[JohnDBarrow]

Here is my 5x5 version to boot.