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The Lt v. Gladiß, who received the HHOX around May 1917, is either Rudolf or Sigismund.
Rudolf was in 3. GzF, died from wounds in March 1918.
Sigismund, from GGR2, was already pronounced dead in VL in Dec 1914, but then resurfaced as heavily wounded and in British captivity in the VL Feb 1915. He is in the ERL as Lt aD. I am not sure if we can tell whether he got back from POW before May 1917.
If not, then the HHOX recipient must be Rudolf.