Hallmark on Silver Jigger

Hello,

I have this silver jigger but can’t find its hallmark anywhere on the web. What do the numbers mean?
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In terms of silver marks they mean nothing. The crown suggests that this has been officially approved as a 25ml measure so the numbers are probably an identification mark of the approving body. None of the marks you show indicate that the measure is silver.

I had a feeling it wasn’t silver.

Thanks for your help!