This looks like the initial one-screw style of Free-Lock Hubs: http://www.ewillys.com/2021/09/09/free-lock-hubs/
“Working on selling parts for my dad who is 82 years old. Is a bit tough to get information because of his memory. I will do my best. He says he bought these hubs for his 1946 Willys Jeep years ago. They seem to be in fine condition. He has had his parts stored for a number of years.”