Endura Northlight BC tubes

Yesterday driving home from work, I drove past a reclamation yard I hadn't even spotted until then. I decided it worth a quick visit, so pulled over and went in. Stood in a dusty corner was these two BC tubes mixed in with a small selection of other tubes. Being pushed for time, I quickly pulled them out along with 6 other tubes, bought them and got them home. It was only when I got them back and cleaned them when I realised I'd stumbled upon some right gems. I've never ever seen a Endura tube actually branded by the maker, in BC and in Northlight colour. I will test them eventually, but all the BC fittings I have are a bit buried atm so it'll be as and when I can be arsed to drag one out.