Oldenburg Flag Pin ID??

[Mike Dunn]

Was wondering if this is part of a set of flag pin backs and approx age.. Thanks Mike

[der-hase-fee]

Here is a picture of the coat of arms of Land (State) Oldenburg: https://commons.wikimedia.org/wiki/F..._Oldenburg.svg

[Wood]

This remindes me of post war badges given away with chewing gum, or something in the UK.
Regards
Pete