RWF marksman badge / coin from 1960

I’m currently renovating the mother-in-law’s house and have found various pieces of militaria, most of which, such as medals, are readily identifiable.

However I’m wondering if anyone could provide more information on what this is:



I know my partner’s father did his National Service with the Royal Welch, so I assume it is a marksman’s award, but unsure.

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