A closer look at the photographs shows "PROV PAT" and "7" stamped on the rear of the cocking arm. Likewise there is "7" stamped on the housing below the rear sight. My initial thought is that the "7" is a serial number which would lead you to think it was a production piece. It would be interesting to know if there are other markings stamped anywhere else on the pistol. If possible, I would suggest removing the grips to see if there are any other identifiable markings underneath.
Another interesting question is why does this example have the "SCOUT" grips of the regular Lincoln Jeffries Scout air pistol. Will be interesting to see what other information can be brought to light on this example.