Your mic was manufactured before the phantom/battery indicator was available that eventually filled the square cavity.
So, that part of your mic amp is period-correct, and of no concern.
I also see no electrical or sonic disadvantages to having filter and coupling capacitors replaced, as was done here, unless these components were of low quality.
I am not a great fan of the BC264 FET, also replaced in your mic. I prefer, and Neumann still prefers the 2N3819 in U87 (Fairchild and others make it). A picture cannot show whether the source resistor which biases the FET was properly chosen when it was replaced.
My biggest concern-one that would affect your mic's resale value like nothing we discuss here-would be your capsule: Was it "reskinned", i.e. the original diaphragms were removed and replaced with aftermarket material by a third party? There is currently no one in the condenser mic business capable of retaining Neumann's famous capsule sound after the original diaphragms have been removed and replaced (for that reason, not even Neumann offers such service). A close-up picture would clear up what was actually done to your capsule. Hopefully a Neumann replacement capsule was installed, which would be fine.
P.S.: The mic, as pictured, will last for decades and its sound will not change, unless you contaminate the capsule with spit and dust (some aftermarket reskins are mechanically unstable over time)
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