Vintage 10-inch Parabolic Primary Mirror for Newtonian Reflection Telescope For Sale

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Vintage 10-inch Parabolic Primary Mirror for Newtonian Reflection Telescope:
$349.99
10-inch Parabolic Primary Mirror for Newtonian reflective telescope.
Preowned: My father has owned this mirror for many years. His plans were to create a telescope to use it with. Instead, it sat on a shelf in his home.
It is 10 inches diameter and one inch thick.
As far as the focal length is, my father does not know how to measure that.
