This Wheat took some doing and a lot of patience as I tried to acquire it from a customer at work who at the time wasn't looking to move it. For whatever reason the W503 set is a tougher one and I don't recall even seeing this card or knowing of its existence before spotting it on that order. However, the eBay gods eventually came through as they so often do and after waiting a while for it to be graded, it now resides in my Wheat PC for all eternity.
This comes from the aforementioned W503 set released in 1922.