I have just read your lead again Reference the badge, If 1WW, you mention 1915, then I assume LSM would mean Leading Stoker Mechanic in which case the badge would be a three bladed propeller with a star above, I then assume he was rated up to Petty Officer at a later date which would the place a "Kings Crown" above the propeller. If you do not know the difference a Kings crown is the type shown in the attachment,
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