The Britannia turbo prop also had two types of props
The 102 with slightly less powerfull engines had hollow square end steel props
The 312 with more powerfull engines had round tip solid dural props
However when the steel props became rare the 102 also started to use solid round tip props as long as matching engines had them say 1 & 4 or 2 & 3
Yes, Hamilton Standard all, if I'm not mistaken, manufactured under license by deHavilland Propellors (later, became HS Dynamics).