Hello!
Welcome to the forum!
I'm pretty sure, that your item is not from Sopron.
Hallmark of Sopron is based on the coat of arms of the city.
http://w3.sopron.hu/intranet/cimer.html
In the coat of arms, and in the hallmarks of Sopron doesn't stand any man figure at the wall, only the 3 towers we can see.
The oldest example I have is from around 1780. I think, you can see the obvious differents!
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The best source about this topic is on the same opinion, all the marks it shows only the walls and the towers without any man figure.
(Kőszeghy Elemér: Magyarországi ötvösjegyek a középkortól 1867-ig/Markzeichen der Goldschmiede Ungarns vom Mittelalter bis 1867)
I hope, this helped a little.
Best regards!
Krisztián