Hi stallard99
I think that the lion of St. Mark on your bowl is a tribute to the history of Venice, without any intent to deceive.
There are many Venetian silversmiths, but also Lombard, Emilian and others who have used and some still use this symbol on San Marco style cutlery and other silverware.
It is true, however, as Dognose says, that there are many pseudo marks intended to deceive, that you find on pieces of silverware in style, almost always alone, without modern marks.
Here is an anthology below
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As for your date deduction, strictly speaking you are right. However I would be more for a dating generically in the first half of the twentieth century.
Immediately after the war (WW2), compliance with the regulations was in some cases a bit flexible.
Best
Amena