Kilby

Hi, i have what we believe to be Margot Fonteyn's pointe shoes. they are a size 4. you can just make out the red pen saying 'FONT' on the bottom of one of the shoes (left). i have tried to show this in the images. there are a few different markings but we are unsure what they are. if you could give us any information which would help to authenticate these we would extremely grateful. Many Thanks.