Ok, so what you have there Alan is a 1951 Model 350 which sold for $119.50 in 1951. The telltale feature is the lettered Filter Queen band around the motor housing and none on the bucket. That bucket is metal, yes? Even your cord looks original as the mid-brown color is just right. Lucky find and the handle is intact as well.
The hose couplers (and possibly the yellowish hose itself) and lower J-wand section is from a Salmon pink model 31 a few years later. They look good!
Filter Queen tools and the various caster bases are interchangeable on all models.
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