90 Mark on Silverplate Flatware - German?

Hi, I am curious about the mark on these pieces. I've read online that the 90 mark is a mark first used in Germany to indicate a specific level of plating, and was later used also on Dutch, Danish, and Austrian pieces. So, I was trying to figure out what the 2 letters mean, makers mark or something else, but I don't know where to start since I'm not sure what these fancy script letters are. GP, GS?

Any ideas about maker, country of origin, or what the letters are?

Thanks for any help!

 

German, one of the 'Hildesheimer Rose' patterns - probably around mid 20th century, looks like 'G.S.' to me, most likely the manufacturer...

~Cheryl

 

Thank you Cheryl, very helpful.