I'm confused. Maltby No4 MkI*? Savage and Long Branch were the only producers of No4 MkI* rifles, weren't they? If so, then you either have a Maltby No4 MkI with Savage bits, or a Savage or Long Branch No4 MkI* with Maltby bits. Either way, I believe the odd bits would have been put on during a repair of some sort.
I wonder if someone at Maltby went nuts in 1944 with an electropencil? I have a '44 Maltby with the bolt release spring that is marked No4 MkI* as well.