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Originally Posted by R Pope
Omega-- The Vickers Mark 1* was an aircraft variant developed for the Sopwith 1 1/2 Strutter in 1916. The standard water jacket was punched with louvers to allow air circulation. Weight with Constantinescu interrupter gear was 28 pounds.
The Mark 11 was a variation with a smaller jacket, also louvered. Introduced in 1917. Weight 22 pounds.
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My understanding is that on US manufactured examples the louvres at the muzzle end of the jacket open to the front so as to act as an air scoop (see camel54.jpg as posted by Maxim08), whereas those of British manufacture had both sets of louvres opening to the rear of the weapon.
Just a minor detail that may be of interest to some....