Max,
From your pictures, nothing looks particularly untoward about the 1915. There is sufficient variation in manufacture of these guns that the machining of the frame ears presented here is not worrisome in the absence of other real problems. To do a real analysis by photograph, you would need to present a much more comprehensive selection of markings and other characteristics, properly exposed and color balanced. If the halos satisfy you, thats more than we can tell you.
The second gun is much easier. As you suggest, it is a put-together parts gun. The barrelled receiver is from a Dutch Luger. The crown/W on the left side is the Dutch acceptance mark, signifying Queen Wilhelmina of Holland. The date on the top of the barrel is the year the barrel was replaced by the Dutch military armory in Indonesia, a common and frequent modification. Take a look at the marking on the extractor; if it says GELADEN on both sides it--and likely the breechblock, if not the entire toggle train--is from a Dutch Luger as well.
There is not much to say about the frame from your photographs. It appears that there is a letter suffix on the frame front under the serial number; this is an indication that the frame is not Dutch, as Dutch Lugers did not have serial number suffixes.
--Dwight
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