I was wondering did they sell those as souveniers back some time ago or what?
Are you asking if the circus sold these bulbs as souvenirs? This could be possible but I don't know for certain. If true, then I can confirm that these bulbs were not solely produced and distributed through the circus as the two elephant bulbs appear in the catalogs and brochures. They could be purchased by any consumer and were for general public sale originally.
The cord on the lamp is an old cloth cord so I figured it might be from the 50's or so.
The catalog data that I have for Aerolux dates from 1938 to 1974. The elephant bulbs appear in all the catalogs that I have from 1938 to 1974, so 1950s is well within that range.
The lamp is just big enough to showcase the bulb.
The bulbs were often sold with simple lamp fixtures that didn't detract from the beauty of the bulb. They were usually simple, elegant, and were designed to focus attention to the actual glow light itself.
Anybody ever see one or know a link where I can find more info on it?
The company that produced the elephant bulbs was Aerolux. More general information can be found at these links:
Figural Glow Lamps in AmericaAerolux catalogsAerolux galleryAs a side note, and since it is Election Day here in the US, Aerolux also produced a Republican emblem lamp that featured the same elephant, but with the added letters "GOP". In the same spirit, a Democratic emblem lamp was also produced. I'll attach some pictures.