Just did a completed auctions search in ebay.

Complete sets from the 1970s and 1980s bring around $10.

A 1956 set in the binder like yours was asking $30 and nobody bought.

A 1936 set without binder recently went for $28.76. Same seller sold full 1933, 1934, 1935 sets for $26 each.

I'm surprised all of these didn't go for more, frankly.