Sentry Flea Collar ‘Last summer, 2,000,000 dogs wore Sentry Collars’
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Year: 1967
Brand: Sentry Collar (USA) 

File Under ︎ Simple and straightforward copywriting

ONE thing this ad does well (AKA Copywriting Tip):

Compare and contrast with a bad alternative.

1.Use specific product facts you can communicate numerically ⇝ “Last summer, 2,000,000 dogs wore Sentry Collars.”

2.Compare your product with a bad alternative ⇝ “Instead of fleas.”