Final thoughts...........................
After further investigating it appears that the B4H engine with the 2 x hole brackets were used in the following 18" Whitehead torpedo types in addition to the above stated ones:
1) A90 /450 (1910)
2) A95 /450 (19100
3) A100/450 x 5,203m & 4,83m (1914)
4) A100/450 x 5,25m (1914)
5) A110/450 x 5,28 (1913)
6) A115/450 x 5,237 (1913)
However the torpedoes that had the large characteristic diameter circular hydro-static diving regulator valve opening were limited to only :
A68/450 (1905)
A90/450 (1906)
A95/450 (1907)
A90/450 (1910)
A95/450 (1910)
A100/450 x 5,203 & 4,83 (1914)
The twin propeller section also seems to "fit", although generic to all Whitehead torpedoes of that period.
Cheers
Drew