Jon, welcome to the forum! Closer pictures would help.
You can either take it outside into (not direct sunlight) and take some more pictures
Use the flash from further away but highest quality of the pixels and then crop down (see how further items are in-focus) and close items are out of focus.
Ensure you are using the "macro" feature. this will look like a "flower", and you press it and it will help. #1 thing is plenty of natural light to take good pictures.
Stripping the grips and refinishing is one of the FEW things that you could do that would not be considered really bad to most collectors.
As Steve says, if it is all matching you run the risk of damaging it. You could buy a shotoer and "maybe" shoot this one infrequnetly.
I have no clue on the TCS marking, that is a new one to me, would need to see pictures.
The DWM is the manufactuer, the orginal manufacturer of lugers. With further info and pictues, we can help you more.
Welcome to the forum!
I am far from an expert but the bayonet on the far right appears to be a police model, one carried prior to WW2 and during. They are worth $500-$700 by themself, I have two of them (I collect Weimar era items).
Things like this are a great rememberance of your grandfather and am glad you have them, take good care of them
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