Bearing the Temple of Heaven brand dates these hat bodies to around 1990 or earlier. This brand was the most respected in the days when parasisol production was handled by two Arts and Crafts corporations of the centrally controlled state. They will have come from the factory I visited in 1985. You can read about this trip here.
The weave quality of these vintage hat bodies is unparalleled even in Grade X of today. They are fine and evenly woven with minimal weave faults and totally unrepeatable.