Hi Lustrestone, the daylight photo is a photo of a photo, so may not be great quality. The other photos were taken with an ipad & shrunk down to fit here by a friend. I don't know how else to get the photos small enough without losing definition

I wondered if it might be an award, or to grace the divers table at the '36 or '48 Olympics.
May i ask, Is it mainly the colour which makes you think its post WW2?