As promised.
Here is a cover posted in September 1918 to Oliviera do Hospital (a municipality in Central Portugal). It bears a variety of stamps:
1. Censurado No 42, applied by the censoring officer
2. CEP - SPC 7, in use at Base Camp, Ambleteuse in Norther France, dated 6th September 1918
3. Censura No 4, applied in Portugal
4. Receiving stamp (on reverse) Oliviera do Hospital dated 23rd September