With no doors, it seems to match up to Glockner Spyders (also was known as Mroz Coachbuilders in Anaheim and Fullerton, CA). I don't know if they still exist but there is a phone number. The no doors simplifies construction and makes for a stiffer body. At $8k and decent running - would be a fun car for weekend jaunts. Make sure it can be registered in your state or universe.
Maybe post it on The Samba under kit cars and see if the dune buggy guys have seen it or another around. https://www.thesamba.com/vw/forum/viewforum.php?f=38
Glockler Spyders 217 East Alvarado St Fallbrook, CA 92028 (760) 728-9615 www.kitcarlist.com/glockler Glockler 550 Spyder for unmodified ’58-74 VW, Turnkeys start at $11,500