The upper sets of lettering are all new, but the actual VIN numbers & letters at the base look original to me. Here's a photo of my VIN plate -- my 3100 was built in Oakland in 1950 too, and the spacing in the actual VIN numbers at the base looks identical.

https://picasaweb.google.com/lh/photo/nuqOOOqPz8YzLoIjvuANXS5gUOnkvy4zzcbIWgQD__A?feat=directlink