I don't believe any IH tractor was fitted from the factory with PS until model year 1955. You could certainly retrofit a 650 system on a W-9.
As shown below, my 650 came with the PS attachment. I am nearly certain it had its own line-item on the dealer's sales invoice. I believe it had to be ordered or retrofitted. BTW, my PS works great although, should the slave cylinder fail or leak, the repair parts are no longer available. This has been reported several times on this forum. A similar but different system was made for the 660.
Don't know what a W-450 setup looks like but it may be very close the 650. Not all parts would interchange. I just completed a Hydrostatic PS system on my W-450. The same could be done with a 650.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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