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It's entirely possible (99.99%) that Speidel supplied them to Longines.
Fixo - Flex, another famous stretchy band company supplied a variety of bracelets for Omegas.
Here's an old stretch band. And it's a real hair puller. Basically just a flattened out spring. I am pretty sure it is from the early 40's, the watch I found it on was last worn in August 1944.