You are correct that there are different versions of this sign used in different periods of Pure's history. Just like with Pure globes, the older plates have "The Pure Oil Company USA" on them. Later version do not have this wording, just the jigsaw and the PURE wording. I just checked the restoration guide and the ones with the company information are from 1947-1957, plain ones are 1957-1961, even though yours is dated a year earlier, it is still an original sign.
Last edited by DWSheffer; Sun May 20 2012 08:43 PM.