Value of a king george stamp

Hi For some time now iv had a gorgeous old Guardian Angel postcard in a photo frame.

As I recently desided to use the frame for something else I noticed it was a very old postcard written to some back in 1913 ?
The stamp is a light green colour. A postage mark of LUTON 8.45 AU 1. 13
I shall do my best with sending a photo. Hope there may be someone who will know if this stamp could be worth anything.

Look forward to hearing from you.
Miss A Williams

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