It's a transitional RG0307 to A204. I say 'transitional' as the dial has had a second printing to put the coronet and De Luxe on the dial. As originally made, circa 1950/51 (the mvt serial dates it to circa 1950), it only had SmithS on the dial but SmithS rebranded the watches circa 1952, introducing the De Luxe range and adding the coronet, supposedly to commemorate the coronation of queen Elizabeth 2nd. So I think this was a dial in stock for a couple of years and given the extra printing to keep in line with the sales schtick at the time.
I have a couple of dials similarly printed and the difference in the printing between the SmithS text and the De Luxe and coronet is quite clear, and certainly not from the same printing plate.
Edit to add - the mvt has had bridges swapped presumably during repair but apart from that it's a very nice example. Even the spring bars look like the original Dennison ones supplied with the watch.