How to remove these carbon brushes?

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Thats more like

A early 50s, 4250, the 4450 came out on the 500 FQ which was introduced in 55,There should be a screw slot in the end of the brush cap, you just unscrew the cap and pull out the brush.
 
it appears,

In your second photo that you undo the screw above the carbon brush, that should hopefully allow you to pull the brush out, try it!
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I bet..

That date written on it was when it was serviced, If you peel off the FQ label on the back, the actual date is stamped in the metal.
 
The screw in the frame above the brushholder just holds the bakelite brushnolder in place. It's like Ken said there should be a brass plug in the bakelite that has a slot in it. You just unscrew that and the brush and spring will come out. Sometimes if the brush is burned you may have to take something and push the brush back through the holder. Be careful around the armature, you don't want to damage any of the segments.
 
I just had the thought were you asking how to get the brass plug out when they seem to be stuck, rather then how to get the brush out of the holder.
 

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