1911 Coronation Medal, any clues?

[Rob]

Anybody have any idea who made these or if it is in a reference volume. Aluminium, 31.5mm diameter, 5.21g and below the lion reads RD NO 572729/10 - the RD NO presumably meaning registered number.

[Rob]

And the other side

[Diaconis]

Heres some info Rob

https://www.numisbids.com/n.php?p=lot&sid=2686&lot=820

[Rob]

Many thanks