WTB : Coronation 1937 ... Need help to find one stamp mint NH

I am after a missing stamp which is : Great Britain Offices in Morocco.
This stamp is Scott # 82 (Stanley Gibbons # 164) and it is 1½p purple brown
of Great Britain overprinted Morocco Agencies 15 centimos.  It has to be
mint NH (or unmounted). If someone can help,  you can get in touch with me
at this e-mail address :

[EMAIL PROTECTED]