The rather hard to find Y-4075 display tube is the smaller cousin to the General Electric Y-1938 display shown above. Like the Y-1938, this tube is constructed using a series of phosphor coated tiles that are arranged in a seven segment pattern with decimal point. This is a very early VFD part number, and like other early tubes it lacks a control grid, making it nearly impossible to multiplex.
The example shown here was actually repackaged in an Archer blister pack for sale at a Radio Shack retail store. The mind boggles at the thought of a time when Radio Shack sold things other than batteries and bottomless piles of tawdry consumer goods.
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