vintage mid-century Melnor Square streamlined aluminum lawn&garden sprinkler

1950s mid-century vintage, streamlined aluminum lawn and garden sprinkler. This sprinkler is marked "Melnor Square Sprinkler" with red anodized aluminum blades. This measures 11.5" long, 8" wide and 4" high. The sprinkler blades are about 4" across. This is in very nice vintage condition.