The Olympia One, introduced in April 1979, underwent several changes or upgrades identified by three different model numbers:
1401 (April-c. Sept. 1979): Essentially a bronze-colored Super J with bronze-painted PN-4 power nozzle (as mentioned earliest ones had the original polished hoods)
1401-B: (c. Oct. 1979 - mid-1982): featuring wider wheels for shag carpeting; "fins" on the bumpers for smoother mobility around corners and edges; a vertical carrying handle & shortened horizontal carrying handle; in late 1980 or 1981 the hose was updated with a "cuff" by the handle grip (like the commercial ones), for extra durability.
1505: (mid-1982 - c. Sept. 1982): same as 1401-B but paired with the bronze-painted model PN-4A power nozzle (plastic versus metal inner bag door panel?) The successor of the Olympia One, the metallic gray Silverado Deluxe was also a model 1505 and was initially paired with the metallic gray PN-4A power nozzle, so the 1505 Olympia One simply reflected the transition between the two cleaners. It may have been that there was a delay in the introduction of the Silverado Deluxe.
The PN-4 (1977-82) has the full length motor housing, and the PN-4A (1982-83) has the partial-length motor housing which provides easier cleaning under low furniture.
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The Olympia One was the official vacuum cleaner of the 1980 Winter Olympics in Lake Placid, NY. Those cleaners sold around the event were marked with Olympics decals by the exhaust port including some Model 1401s and some 1401-Bs.
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Why "Olympia ONE"? Because there initially was a Canadian-marketed "Olympia II" for a brief period, which was a straight suction cleaner (not sold with a power nozzle). It was identified as the Special Model 1453 in the U.S. and shortly after became (or was it an option?) the Deluxe Special Model 1453, when customer preference dictated a standard power nozzle rather than optional. Anyway, 1453s are almost always sold on eBay and elsewhere with power nozzles. The 1453 was similar in appearance to the Olympia One but noticeably different in that it lacked the automatic control shut-off function with the bag capacity dial setting, a rocker on/off switch, the chrome top panel, the bumper fins, the chrome hubcaps, and the horizontal carrying handle. The bag door was also styled differently. In addition, the cord winder was optional instead of standard. Some collectors have nicknamed it the "Olympia Special", but no company literature used the term. The 1453 was later painted in two successive color combos after the bronze line was discontinued. Electrolux Corp. retired the 1453 in 1987.
To top things off, there was also a briefly-marketed commercial "Special Model 1453" with a 3-wired power nozzle (model PN-4C).
The bronze line also included the Model CB commercial canister, the Model B-8 Polisher/Scrubber/Carpet Beautifier, and the brown and ivory-colored single brush Turbo Rug Washer.
I have three Olympia One user manuals copyrighted: 1979 (1401), 1979 (1401-B) & 1981 (1401-B). I'm unsure if there were 1980 or 1982 updates.
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Information credits: Doug Smith, Jimmy Martin, Tom Gasko, & John Anderson; along with my personal research