The RAF strap? A partial history? U.S. Government Specification MIL‑S‑46383 (June 1, 1964)
There is a lot on the Internet including the original drawing for strap and buckle spec for MIL‑S‑46383. A fun read if this sort of stuff interests you. A sample of what is available online on a google search below. U.S. Government Specification MIL‑S‑46383 MIL‑S‑46383 is a U.S. military specification for woven nylon wrist straps intended for attaching instruments such as watches, compasses, and depth gauges to the wrist GlobalSpec . Scope and Purpose The original MIL‑S‑46383 (June 1, 1964) covered material and fabrication requirements for a woven nylon strap ASSIST-QuickSearch . It was designed to ensure uniformity, durability, and compatibility for military use. The specification was later updated as MIL‑S‑46383B (Sept. 16, 1970) GlobalSpec , which defined three strap types: Type I – Special purpose, non‑magnetic buckle (for use where resistance to magnetization is required) Type II – General purpose Type III – G...