I can’t really tell you anything about your 7.65 Para round except to say that I have a round with the same bluish-green primer seal, identical in tone to the one you picture above. However, my round is headstamped T 4 T 65. My round has the same four longitudinal crimps on the neck, just above the shoulder, pretty normal for Swiss 7.65 mm Para rounds.
It is hard to tell from a picture, but the only difference I think I see in the picture from mine is that your round seems to have a slight, additional roll mouth crimp, which mine does not have.
The bullet in mine is a normal GMCS FMJ RN bullet. I do not have one like yours. Normally, I only collect this caliber by headstamp style, and while I collect small differences in headstamp font, or any other feature of the cartridge, I do NOT collect by lot number and/or date.
Your bullet appears in the picture like it might have a crimping cannelure on it, whether manufactured that way or the cannelure simply formed by “crush” of the mouth crimp.
This one I have is the only Swiss 7.65 Para, out of a fair number of specimens, with this color primer seal, so I have no doubt that it may have some special significance, although I don’t know what. All of my later ones (none before the date you mentioned, of 1971) that have any primer seal, the color is dark blue (save for one specimen with a white seal superimposing a blue one. If I ever knew, I have forgotten the significance of the white seal, which appears to have been added.