Based on watch straps from the 1940's, the Corp. Canvas feature heavy-weave canvas cotton with a single pass construction.
Haveston M-1918C Canvas Watch Strap – Welcome to Strap Sense
A Closer Look at High-Performing HAVESTON Straps and Military Watches
A rugged cotton canvas strap based on the shade ref. OD No.3 found in US field equipment in 1942-1944 service . Keeper style varies. Please refer to
THE M-1943C CANVAS STRAP
20mm 22mm The M-1945T Strap by HAVESTON Straps
The AAF Sea Grey-637 Strap by HAVESTON Straps
High-Performing HAVESTON Straps and Military Watches
20mm or 22mm Black Canvas Watch Band Brushed Roller Deployant Buckle, - Strapcode
A Closer Look at High-Performing HAVESTON Straps and Military Watches
Hemsut Canvas Watch Bands, Quick Release Military Watch Strap, Fabric Replacement 18mm Watch Bands for Men
THE A-12 CANVAS STRAP
Haveston M-1918C Canvas Watch Strap – Welcome to Strap Sense