The Cleansweep Seven was mentioned by Oliver Wood as a possible broom for Harry Potter when they were first introduced to each other during Harry’s first year (PS9). This suggests that no later Cleansweep model was available at the time.
The Ravenclaw Quidditch Team in Harry’s third year are said to all be flying on Cleansweep 7s (PA12).
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Lexicon list of Broom Manufacturers
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