What are omnibus series ?
The countries belonging to the Commonwealth used to release at the same date identical stamps for which only the name of the country and sometimes the postal values were different. These stamps produced between the year 30’s to 50’s were called omnibus series. This denomination applied later to stamps released by other countries such as former colonial dependencies for which it was less expensive to base their stamp program on a common design (French, Dutch or Portugiese former colonies for example). Today, some small countries using the same stamp printing house (House of Questa, Crown Agents, …) can be proposed to enter in a large series (stamps with the same frame design) involving dozen of countries which are not necessarily politically linked. These stamps are also considered as omnibus series. These stamps are reported here, but without details, because they cannot be considered as true joint issues. On the contrary Europa CEPT stamps with the same design and the same date of i
