The left stamp looks like a horisontal fleur-de-lys.
Over the letter P to the right there is a crown or a ship (hard to see)
Wondering if this could be a Hanau pseudo mark.
i am certainly no expert, but if you peruse the many marks at the address below, you will see the use of both crowns and ships above initials, as well as the use of the fleur de lis. The problem with these marks as i understand it, is that they are actually not registered marks, many exist with no documentation and variations/combinations were used.
In particular, i draw your attention to ~1/4 way down the page to both Gebruder Neuman and Friedrich Reusswig and their use of both.
925-1000.com/Fgerman_hanau_marks_01.html
tm.
I think its older than 1900 - see pics in "What’s this/silver bowl.