Thanks for posting. It's interesting that the two photos posted of numbered Ulan are both for the 19th (http://pickelhaubes.com/bb/viewtopic.php?f=50&t=11049" onclick="window.open(this.href);return false. Although one is the reserve regiment. Does your's have any stamps inside?
There are no markings in either the cover or the helmet. I got the tsapka and cover several years ago but I don't remember where. I do remember that the pair was rather cheap <$600. The helmet is a M1915 Wuerttemberger.