In reply to SiWood:
Is this one what you are looking for? This one is kind of of sentimental value from the stuff I did with it thirty years ago (and still in use on my climbing wall sack!), but is never fastened, so I might part with it if I don't have another!
Edit: Just noticed you want a blue one. Just possible my ancient blue Haston Vallot has one if I have it still!
Post edited at 19:00