Yes, a 1946 speedo has a different drive mechanism and the input shaft exits the body at 90 degrees. From late '46/early '47 the input drive was at an angle to the body much like later speedometers.
I think the dial face and VW tab at the top were more 'blue' than 'grey' in 1948. I only noticed this from the early speedometers I have owned, but I maybe wrong.
47 Beetle, 56 UK Karmann Cabriolet, 56 UK Beetle, 57 UK Type 2, 59 UK Beetle, 66 UK Fastback.