Gosh didn't realise my mention of MMM would arouse such interest.
My grandma bought mine in 1950s and I loved her adventures with Little Friend susan and billy Blunt. I read the stories to my two Ds.
Her full name was Millicent Margaret Amanda and I remember I used to think how lovely it must be to have such a wonderful name.
My copy is one of my treasured possessions.
Ginnie