Here is a Spanish language box of 7.65x54 ball cartridges with SS bullet manufactured by FN in 1939. All cartridges inside have cases headstamped F N 39, except for five F P N 38 (initial for AP) and two F PT N 38 (initials for AP-T). Also, most cartridges, including those marked P and PT, have a dark blue primer sealant, while some headstamped F N 39 also have dark purple and dark green sealant. All of them weight about the same: 24.95 g +/-0.05.
And another box of 7.65x54 cartridges by FN, in this case in French language and loaded with incendiary bullets. All cartridges inside are headstamped F SS N 35, except of a single example headstamped F S N 35 (however, half of the contents are missing). These weigh 22.75 g +/-0.05.