antique vintage copper lawn sprinkler w/ art deco cast iron stand

Vintage copper and cast iron lawn and garden sprinkler, not marked at all that we could find. 30s? 40s? 50?

It's about 8" across the rotating arms, has only slight traces of the original paint remaining. This looks very good overall - though the metal base has a rust color, it's not very rusty, not pitted or damaged.