Actually I think the '70s Panasonic made Le Tour is a combination of 1" ISO and JIS. The crown race ID is 26.4mm and the frame cup OD is 30.0mm, which means if you had nothing to start with then you'll need to buy both a 1" ISO and a 1" JIS headset and combine the parts to make one that works.

If your replacement fork includes a crown race (ISO) pre-installed, then you can just get a JIS headset and you'll have all the parts you need.