Range Graduations for MkVI ammunition on British/Dominion WW1 scopes.....

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Presumably the "bayonet mount" type rather than the interrupted thread as modifying rifles was a minor heresy at the time.

(There would been nowhere to attach to an SMLE obviously)

Your picture does NOT show a Maxim silencer. This is also obvious by the name on top of the patent.

Attached pictures of my two Maxim silencers (one cutaway), both on M.1903 rifles.

If it is of any help, Austria also trialled silencers on the M.95 straight pull rifle in 1915.