This was the first version of the B7, done in gray and white to match the Model F. It was introduced sometime in 1958 or 1959, not sure exactly when. It does not appear in an Electrolux instruction booklet (for the late version of the Model F) until 1959. I do know it wasn't made for very long because the turquoise model was introduced in 1960 with the Model G.

I'd love to have had this as it's pretty rare -- I've got one in fair-to-average condition and have only seen a couple of others over the years -- but didn't bid. Was surprised, given its significance, that there wasn't more aggressive bidding on it.