"On the other hand, she rides a Comet Two Sixty, which is going to look like a joke next to the Firebolt."
-- Oliver Wood (PA13)
The Comet Trading Company was founded in 1929 by Basil Horton and Randolph Keitch (who had both played for the Falmouth Falcons Quidditch team). The company produced a very popular series of broomsticks (QA9).
Features and models
Comets orbit the Sun on long elliptical paths and consist of ice, gas and dust particles. When a Comet appears in the sky it is a beautiful thing to behold - so quite a good name for a flying broomstick.
Lexicon list of Broom Manufacturers
Although the dates printed on the Daily Prophet Newsletters are:
the timeframe for these events is 1992-1993.
From the Web
Writing by J K Rowling on Pottermore: The Daily Prophet
Harry Potter Wiki: