If this postcard is from the series I think it is, it likely dates from the mid teens. I have 21, all of which originally entered the hobby from a single source. The PCs originally were thought to be produced by a Cleveland newspaper. I will try to dig mine out later and find the one or two that help pinpoint the years. If the OP could post a scan of the back, that might help.
Of course, the origin of this one could be totally different from mine, but I was struck right away by the similar "look." Another possiblity is that images from earlier seasons were produced at a later date, but none of mine indicate that was the case.
