PCM's guide to gas pump restoration (first edition) on page 186 shows the Sinclair Power X the super fuel globes were used from 1953 to 1959. The new trapazoid logo did come out in 1959 also. Dino Supreme came out in 1962. Also from 1959 - 1962 there were two other Power X globes in use. So while it is possible the clock was made in a logo transition time frame, I would be careful...

US Air Force Retired, 1981-2007