The CWG have a slot on the Helles Memorial for L/Cpl 2075 Harry Gibson, 25 yo, d. 19/6/1915, which looks like him. His medal card gives his rank as Pte, and says he went missing on that date. Two spaces above is a card for a Cpl 508 Harry Gibson, also missing on that date, but without a memorial.
They are both remembered on the same panel of the Helles Memorial
GIBSON, HARRY
Nationality: United Kingdom
Rank: Corporal
1st/9th Manchester Regiment
Age: 24
Date of Death: 19/06/1915
Service No: 508
Additional information: Husband of Sarah Florence Elizabeth Gibson, of 132, Oldham Rd., Waterloo, Ashton-under-Lyne, Lancs.
Casualty Type: Commonwealth War Dead
Memorial Reference: Panel 158 to 170. HELLES MEMORIAL
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Name: GIBSON, HARRY
Rank: Lance Corporal
1st/9th Manchester Regiment
Age: 25
Date of Death: 19/06/1915
Service No: 2075
Additional information: Son of the late Thomas and Mary Gibson.
Casualty Type: Commonwealth War Dead
Memorial Reference: Panel 158 to 170. HELLES MEMORIAL
Do you have them on 1901 Census? If so can you give us the reference please
Ta
Wendi