If I Don't Hear To The Contrary I Expect You Saturday At ____ Sharp

Front:
FI DONT HEAR To THE CONTRARY I EXPECT XI SATURDAY 瓜瓜 AT SHARP. eseess

Back:
it for Inland Postage, but the right hand side must be reserved for address and stamp only. on this side. B.B. LONDON SERIES NO E. 39. PRINTED IN GERMANY.