Assertion: astronomical eyepiece | /r/HasProperty | manufactured in the united states
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text: The barrels of all modern astronomical eyepieces manufactured in the United States have either a 1.25 inch (31.5 mm) or 2 inch (50.5 mm) nominal exterior diameter; many older eyepieces some eyepieces manufactured in Japan have a 0.965 inch (24.5 mm) nominal diameter.