Help Dating a Floor Lamp

Hello,

I found this lamp at a church rummage sale several years ago. There is no makers mark that I can find. It has the look of an assembled piece in many respects, in fact, the base looks very much like a mic-stand with a cast steel base and knurled height adjustment at the mid-point. That said, the top is clearly not a home made piece. There are rubber gaskets that support the globe, three of the original four remain though cracked and brittle. The cord appears fairly early, I'm guessing 50s. Can anyone help with an age or any other history? Thanks! WilliamB