I had a local US wrecker send some used brake/fuel line clamps up to me. It looks like they came off a vehicle pulled from a swamp with the crud on them.
Either way, my suspicions on the larger 11/32" + 15/32" clamps being orange were correct, here's 3 more. This was over a faded gold plating, which in turn is over a silver plating.
Firebird fuel brake line clamps orange gold used 11-32 + 15-32 (1) by
Ben, on Flickr
Firebird fuel brake line clamps orange gold used 11-32 + 15-32 (2) by
Ben, on Flickr
Firebird fuel brake line clamps orange gold used 11-32 + 15-32 (3) by
Ben, on Flickr
Firebird fuel brake line clamps orange gold used 11-32 + 15-32 (4) by
Ben, on Flickr
I didn't request them, but they also sent, and charged for, a handful of fuel return 3/8" clamps. As noted prior these are a light blue over silver plating. Interestingly, in a non-interesting way, both the types with tabs and without were the same colour, barely visible around the edges and vague tint.
Firebird fuel line retainer clips 3-8 light blue used (1) by
Ben, on Flickr
Firebird fuel line retainer clips 3-8 light blue used (2) by
Ben, on Flickr