“Speedy Calculator”

Data:

• This spiral slide rule was mentioned in Skid Stick Issue #51, October 2015, page 8.
  It was originally published in a 2015 sales catalog by the company Tesseract (item #48).
• The inscription on the lid says: “Speedy Calculator, Bté. S.G.D.G.”
• 19" wide
• The device has two drums that can be rotated independently, and two pointers.

Questions:

1. Manufacturer?
2. When it was made?
3. etc.