I have updated the Vintage Seiko Dive Straps article to include details of the Seiko 1972 Watchband Catalog No.1. This catalog was discovered and detailed by Gerald over at The Grand Seiko Guy. The original article detailing the catalog can be found at Seiko Watchband Catalogue – 1972/No.1
This catalog provides the first official confirmation that Seiko released orange versions of the Chocolate Bar and XGL-731 Tire Track straps. There is also a newly discovered strap that does not seem to have been issued with any Seiko models but was just available as a replacement part.
The updated article on the Vintage Seiko Dive Straps can be found here - Vintage Seiko Dive Straps