Vintage Ceramic Cover for Offset Flush Elbows/Top Spud Toilets

This ceramic cover dates back to the early 1930’s. It’s a nice blue color and we’re not sure the maker. The patent number that’s stamped in the back (see photo in the gallery) comes up as a typewriter part. This cover stands 6 7/8″ tall and is 4 3/8″ wide. It’s intended for use with 1 1/2″ offset elbows. As for condition, the left side has some sort of stain on the side, see photo in the gallery. Also, the left side of the front has faded slightly. We suspect that both the fading and “stain” are sun-related but cannot confirm this. One only!