From what I have been able to ascertain it sounds like your cleaner is the second variant--circa 1969-70. Does your hose have a pistol grip or gooseneck grip?
One longtime Electrolux salesperson said that the pistol grip was first introduced in the late '60s for a short time but the gooseneck grip was brought back due to its susceptibility to cracking. It was reintroduced sometime after the Jubilee's debut (some early literature even shows a gooseneck grip on the Jubilee's hose).
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Here is an estimated timeline of features by year:
1968: smooth surface body, teal front panel, black control panel--no #s on indicator scroll, no small tool clip, no screen in bag chamber vent, classic ivory pn wand with PN-1, electric pigtail-connect hose with gooseneck grip, Model G motor, metal handle, serial on bottom of cord winder
1969: smooth surface body, teal front panel, jade control panel--no #s on indicator scroll, small tool clip, screen in bag chamber vent; teal, PN-1 ribbed telescopic wand and elbow--both w/tab releases (like CA), electric direct-connect hose w/pistol grip, 2nd-version motor, plastic handle, serial on stabilizer
1970: smooth surface body, teal front panel, jade control panel--no #s on indicator scroll, small tool clip, screen in bag chamber vent; PN-1 teal smooth sheath and wand--both with lever release, electric direct-connect hose with gooseneck grip, 2nd-version motor, plastic handle, serial on stabilizer
1971: smooth surface body, jade front panel & control pane--no #s on indicator scroll, small tool clip, screen in bag chamber vent; PN-1 teal smooth sheath and wand--both with lever release, electric direct-connect hose with gooseneck grip, 2nd-version motor, plastic handle, serial on stabilizer
1972: textured surface body, jade front panel & control panel--no #s on indicator scroll, small tool clip, screen in bag chamber vent; PN-2 teal smooth sheath and wand--both with lever release, electric direct-connect hose with gooseneck grip, 3rd-version motor, plastic handle, serial on stabilizer
1973: textured surface body, jade front panel & control panel--#s on indicator scroll, small tool clip, screen in bag chamber vent; PN-2 teal smooth sheath and wand--both with lever release, electric direct-connect hose with gooseneck grip, 3rd-version motor, plastic handle, serial on stabilizer
1974: textured surface body, jade front panel & control panel--#s on indicator scroll, small tool clip, screen in bag chamber vent; PN-2 teal smooth sheath and wand--both with lever release, electric direct-connect hose with gooseneck grip, 3rd-version motor, plastic handle, serial on stabilizer
Somewhere I read that the later bumper logos had a black boat-shaped border rather than the red; however, I have never seen a textured body one without a red border.
At some point the floor/rug tool was changed from teal-colored plastic and brush plate with an ivory bumper to ivory-colored plastic and bumper with a teal brush plate (the Jubilee's was the same except for the gold brush plate).
Another possible update is that the power switches of late variants bore a shock warning like the gold 1205s through the gray 1505s; however, I may have just seen one that had a replacement.
The list above is likely incomplete and not necessarily entirely accurate--along with most Electrolux information due to a lack of accessibility to company literature.