The current version of Wild Musk isn't worth the postage let alone the bottle, dont even bother with it. Its weak, insipid and cheap smelling, a mere shadow of the original.
I'd say Ethylene Brassylate would be the best jumping point to try and recreate it. A bit of Deer Musk to give it some depth and this is where it starts getting tricky. White Musk? Possibly.
There's some sweetness with citrus, possibly a combination of orange and vanilla. It's not smoky so I would eliminate vanilla bean. I would say a touch of sandalwood and patchouli in the base, but only in trace amounts. There are probably more ingredients to it, perhaps Ylang Ylang, Rose and Jasmine, but that's as far as I get with it.
Keep in mind that today's ingredients are not what was used back in the day and you're never going to be able to replicate it accurately in that respect. But good luck to you.
I remember clear as a bell how Wild Musk smelled, I used to steal drops from mums bottle. Boy, she hit the roof when she found out! I purchased a bottle of the new stuff for her birthday recently and it was so bad, I didn't give it to her. Last thing I wanted was to was add insult to injury. Some gift that would have been... "Hey Mum, remember how I pilfered your precious musk oil? Well here's a crappy remake of it to make it up to you".