A Strange one, any ideas?

[SHAKEY2]

My son just bought this from a guy who said it belonged to his dad, now his dad apparently played it regularly until 5 years before he died in 1969. It has never been played since. There is no name on it but it but it is obviously professionally built as it comes in a good fitted case. If anyone has any idea as to the make or age of it I would very much appreciate any information. thanks for looking. Dave.