Tank: Diamond J/Model 1521--the first in the 1521 series--which marked the redesign of the earlier 1205-era design. It did, indeed, debut in 1984, which was Electrolux Corporation's 60th anniversary (the original company, AB Electrolux of Sweden, goes back further). The colors are known as sand and jade (dark green). The sand-colored power nozzle was either a 'PN-5B' or the second version of the PN-5 (black hood). Around 1986 DJs were paired with the jade-colored PN-6.
The 1521s also included the:
Marquise w/PN-6A (or PN-7?) - 1987-88 (taupe/sand)
Grand Marquise w/PN 6A (or PN-7?) - 1988-89 (lt. sand/navy)
Legacy w/PN-1684 - 1989-90 (lt. sand/navy)
Ultralux, w/PN-1684 - 1990-91 (lt. sand/navy)
Ultralux LX w/lighted PN-1683 - 1991-92 (navy/lt. sand w/chrome top)
Ultralux Classic, w lighted PN-1693 - 1992-1994 (navy/lt. sand w/chrome top)
All use the classic 'Style C' bags (introduced in 1952) which are still available through Aerus/Electrolux. Power nozzle brushes are still available.
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Upright: Model 1451E sand/jade (1984-86) It was the last of Electrolux's original series of uprights. Even though some say 'heavy duty', later ones do also; so I refrain from calling the the 'heavy-duty' series.
Others in the series include the:
Model 1363 - 1977-78 (golden yellow/white)
Model 1363 - 1978-79 (tan/brown)
Model 1451 - 1979-80 (tan/brown/orange)
Model 1451E - 1980-82 (tan/brown/orange)
Model 1451E - 1982-84 (2-tone gray)
They take a different bag (that have been discontinued by Aerus/Electrolux) than the L-shaped uprights that succeeded them (1986 - present) . I would imagine that OEM brushes are no longer available through Aerus but don't know if aftermarkets are.