The sistership Britannic had according my knowledge never a Camouflage painting, the second sistership, the
Olympic, was really painted with
dazzle camouflage and used some time as troop transport
en.wikipedia.org
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HMT
Olympic in
dazzle camouflage while in service as a
troopship during the First World War
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When I searched I found two different schemas sown on some photos
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Your camouflage is very close to one of them