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mmmmmhhh..., I have some doubt. There was actually a Milanese shop dedicated to Saint Ambrose, but the image from the Sambonet is completely different and the initials do not match. There would also be a Bolognese shop dedicated to S.Petronio, of which very little is known, but usually the Bolognese silvermaker's marks are in a circle or an oval. For now I'm in the dark.
Regards
Amena
Much congratulations! Being that search engines are still pretty crude devices, can you cite the identification source here so it will be linked to your sample.