When there is no AK, a single "5" makes lots of sense to me.
When I look at the symbol on the right of AK closely, there are actually two symbols.
The one on the top is "4", I would assume this one being a Simson inspection mark (same theory applies to "5").
The one under "4" looks like a crown. It's proabaly AK's inspection mark.
So, when there is no AK, there is no crown. Only a single "5".
Does AK always go with a crown? I don't know.
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