Casting Number: 901.101.102.10 The casting number in this 910 crankcase is not the same as the 906 (901.101.101.10 and 901.101.101.12) and there may be some unique differences in the sand-castings among them.

This is a Magnesium 910 Crankcase https://pbase.com/9146gt/image/64922232 it is stamped "910 015". The 906 and the 910 share the same sand-casting and the only reason why I'm posting it here, a pictorial reference.

This very, very rare Magnesium crankcase was unfortunately damaged https://pbase.com/9146gt/image/64922240 and had to be repaired, at all costs! Take a look...