Help With Identification - British? Yellowish 20c

Help with identification, please: Looks British, George V?, but "c" would more likely be "p" at that time and bottom right word maybe "islands"?

Thanks, appreciate your help,

Maybe Kenya and Uganda.

As mentioned above, it's Kenya & Uganda (1922).

"c" would never have been "p". "p" is only used for GB decimal currency. "d" would have been used for £sd. In East Africa, it was £sc.

Kenya and Uganda Sc#25
See under "KUT" (Kenya Uganda and Tanganyika)

Postmarks on mine MACHAKOS and ENTEBBE

Others may be KERICHO MACHAKOS MUHORONI MORU NANYUKI.

Good job, would likely never have solved, thanks to all ...

Interesting fact:

Due to the Oval Vignette, being displaced in its Oval border,
we can thus conclude, this stamp, although being 1 colour,
was printed in 2 PASS PRINTING PROCESS
(2 dies)

Key and duty plates.

Thank you NSK
I was always wondering why the Australian Kangaroo stamps had
"Duty Plates"
Now it all makes sense.

wiki
The idea was refined by De La Rue in 1879 when the printing process was split into two through the use of a key plate (or head plate) for the bulk of the design and a separate duty plate for the name of the colony and the value. These are often known as key plate stamps. While key type stamps are always of one colour, key plate stamps are bi-coloured. This method has the advantage that most of the design remains the same in each of a stamp series with only the value, name and colours changing.

Key plate stamps were used extensively by Great Britain, Germany, France, Spain and Portugal.




This then must be the exception to the rule?

Further Postmarks noted :

NAIROBI and DARUSSALAM (abode of peace)

The key plate is the one with the effigy of George V. Most of the key-plate issues have a design including the head as key plate. The name of the colony and value are the duty plate. In some British stamps QV Jubilees and Edward VIII, you will find the value and head were printed from one plate and the frame from another. Difficult as the key plate also carries the duty tablet.

This one appears to have a head in an oval, likely used for several stamps in different colours and separate frame with duty used only for this stamp. There, the definition of the key plate and the duty plate is clear again.

Head and duty plates might be more precise wording for this one.

Rules cease to be that when there is an exception to them.