I'd be surprised if anyone still makes 1 inch pitch chains.
Technically, they weren't 1 inch pitch but 1/2 inch pitch with every other link being solid, i.e. without a space between the side plates for the tooth to sit in. They were favoured by track racers as it was thought that it produced a stiffer and thus more responsive chain. From the side they look the same as ordinary chains unless you look carefully.
I'd be surprised if anyone still makes 1 inch pitch chains.
Technically, they weren't 1 inch pitch but 1/2 inch pitch with every other link being solid, i.e. without a space between the side plates for the tooth to sit in. They were favoured by track racers as it was thought that it produced a stiffer and thus more responsive chain. From the side they look the same as ordinary chains unless you look carefully.
A bit like oval chainrings - a passing fad.