First postage stamps of Bangladesh 1971

First stamps of Bangladesh 8 value set. Issued by the Bangladesh Government in exile on 29 July 1971. This was later given postal validity after independence. Now after the Victory of Independence on 16th December, a few of those stamps were overprinted with "liberated" in both local and in English language, these sets are very rare to come by. The last set is stamped with Mujibnagar PO just before independence, happy collecting. Set1:FirstSet £15 Set2:SecondOverprint £24 Set3:Used £12 Any issue or question please let me know.