https://en.numista.com/catalogue/pieces13806.html
Maybe an error version of that 24mm silver coin, as yours has two reverses ?
BUT - here mentions aluminium and slightly smaller versions which are the same both sides ...
http://finds.org.uk/database/artefacts/record/id/393927
'believed to be gaming pieces'.
'They were probably made by the firm Lauer of Nuremburg in the mid to late 19th century'.
Inscription: GAL.LOD.ILL.REX A.A.1859 HVNG-BOH ET VEN
Broad period: MODERN
Date from: Circa AD 1859
Date to: Circa AD 1900
Dimensions and weight
Thickness: 1.3 mm
Weight: 2.3 g
Diameter: 22 mm
The above is from where someone found nine of them ...