I found an unused 1947-48 Pennsylvania one for my 47 business coupe a few months back. In this state any unused ones are supposed to be turned back to the state so the odds of something like that surviving are almost none.
Available as reproductions! Click the link below. Note that the "official number" on the 1930 sticker is the same as your 1941 sticker......"307429". Available numerous states and years. DD
Mine is an original. What's funny is in my high school days if yours was one day out you would get pulled over. We've had people come into the shop with the sticker expired for six months and they've never been stopped. I think they were larger and the windshields more straight up and down so they were more visible.