I rewatched part of the video with English subtitles. Near the beginning, the host refers to the car as a 1951 model, then goes on to state that it was constructed in the builder's garage in 1951. I didn't watch the entire video this time, so perhaps they discuss the timeline in more detail later in the video. In case someone else would like to watch it:
YT channel: Didi TV
Video title: *UNICO NO MUNDO* FABRICADO EM CASA HÁ MAIS DE 70 ANOS !!!
Dated posted: 03 Nov 2024
I agree that it looks far too modern for the 1950s, so I'm removing the year from the thread title.
A closer look at the badge: