The cover of a French 1957 Monopoly set (see picture) appears in two web sites. It was evaluated at $2,456 on one website, workandmoney.com and estimated for auction at £2,000 on another website dailymail.co.uk.
There are two types of Monopoly white box sets, a long one, and a smaller, square one, more in use in Europe, in which the board is folded in four squares; the long one was sometimes also used in France.
Is there a means of determing which of the box sizes is that of this very valuable 1957 French Monopoly set?