I think that Chris has it correct Des as here is a Pic (Side View of the Stratheden) and as you will see it has no cut out as does the one in the question!
Cheers
I know that the Funnel is sloping but that could be an angle of the Pic ???
Another Pic of the Ranchi ??? Now if one looks closely there is what looks like a small sort of Funnel at rear of Main Funnel (not sure as what it is) but it is the exact same in the Original Picture Supplied by Hazel and then by Chris! Not sure Seen here in Malta in 1947
So I think we have it solved . Well hope so LOL