Some are of ballet dancers from the 1950s ~ Errol Addison; Bridget Kelly, Ronald Embler etc. Actually they may all be but I cannot make out some of the signatures and those I can I haven't found on Google.
Presenting a Rare Ballet Shoe which Belonged to and was Worn by Dame Alicia Markova, who was Considered One of the Greatest Ballet Dancers of the Twentieth Century, and along with Dame Margot Fonteyn was the only English Woman to be Recognised as a Prima Ballerina Assoluta.
I have shown 4 photos of this John Field signed card from 1951. John Field was an English Ballet Dancer born in 1921 and he died in 1991. Frederick was the founder and the president of the Society of Autograph Collectors -SAC in the UK.
I have shown 3 photos of this Yvette Chauvire signed card from 1952. Yvette Chauvire was a French Prima Ballerina and actress born in 1917 and she died in 2016. It is signed- Yevette Chauvire London 31 Aug 1952 in blue fountain pen.