I can usually identify older trikes by certain design features but this one has me stumped. I can only guess it is late art deco around the early 1940s. The seat style would fit that time period or anywhere in the 1940s for that matter. If earlier, it probably would have a more streamlined style seat. The semi-pneumatic tires also point more to somewhere in the 1940s. I don't believe this dates as late as the early 1950s due to the deco-ish frame design, but I could be wrong. Hope someone can shed some light on a maker and more accurate dating of it for you. Interesting find!
Dave