Vintage Sterling Silver ABSTRACT/FLOWER Brooch

Item is in good used vintage condition Light to medium wear Light to medium scratches Pin back in good working order Marked 925, t6 or tg-2g? Not sure. It’s very hard to make out the stamp mark. May need a cleaning if desired Note: someone wrote in marker c265 not sure what the purpose of that was. It was like this when I got it several years ago. See pic #6 To the left of the 925 stamp mark is some pitting???? Not sure what it really is. See pic #5 Weight 26.4 grams