Pinsir is a Bug/Flying type Pokemon and it doesn't appear in the Safari Zone.
The Safari Zone is a feature in Pokemon Red, Blue, and Yellow, where you can catch Pokemon in a special area with limited Poké Balls. However, the Pokémon that appear in the Safari Zone are pre-determined and Pinsir is not one of them.
To catch Pinsir, you'll need to find it in the wild in the Kanto region. It is most commonly found in Viridian Forest during the day.