I have two new old inventory aircraft spruce seatbelts part# 13-00403 tan color. These are still in the original packaging and have been sitting in my office desk since 2008. $150.00 for both plus $10.00 for shipping.

I’m a parachute rigger and know a few things about nylon…

The two enemies of nylon are UV exposure and abrasion - neither of which seem to apply here. I would not be too concerned about the DOM (date of manufacturer)

GLWTHS