Rare Collins French Gem Dictionary

I recently bought a book which I think might be a rare or valuable book. It's pocket sized and on the cover it reads "Collins French-English English-French Dictionary" On its introductory page it reads: Collins French Gem Dictionary General Editor: G. F. Maine First Published 1952 Printed in Great Britain By Collins Clear-type press On the first black page it has a name and date written on it: T. I. Aspell 20th March 1958 West Deyne It has blue leather cover with "Collins French Gem Dictionary" written in the Seam and is in very good condition with all the pages intact. I just wanted to find out if it is rare/valuable and if it is how much can it be worth and where and how can I sell it? I'm attaching pictures of it.