I should like to hear the patter of your feet at Ely.
You can see where, at the bottom of the shoes, you 'untuck' the flap and then when you lift the feet, there is a piece of paper folded like an accordion with 12 images from Ely on each fold.
Postmarked in 1912 with a Great Britain King George V stamp mailed to Martha's Vineyard, Mass. USA
Here is a scan of what the images look like on the folds ...
Great Britain stamp 1911
King George V with Lion