3 prong silver forks hallmark

can anyone help with a hallmark which looks like two script letters GI and number 90
thought to be brought from germany in about 1945…any help appreciated

also2 prong pickle fork with half moon and crown made up of three stretched o,s and flat o base with 800 HTB afterwards…thanx

The GI 90 is a silverplate mark, probably German.
The 90 refers to the thickness of the silverplate.

The HTB mark was used by Hanseatische Silberwarenfabrik of Bremen, Germany.
The 800 is the fineness of the silver.
925-1000.com/Fgerman_marks_a1884.html