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Without more info it is a complete guess..? What is missing ? How bad is it realy ? How (restored) do you want to go ?
Missing parts...Most likely the restoration will cost more than it is worth..depending on your value of of it and overall condition. Fairly large number of firearms from that era have hand fitted parts. Which means someone will be hand fitting new ones. Not just swapping parts. They might get lucky but plan on someone spending time on it. Which relates to money.
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This is good advice.
Usually with guns that are not rare (which is most of them) once you complete a restoration, you've put way more money into the project than the difference in value gained by the restored condition.
In other words, you'll sink about $400 into the project and only gain about $200 in value.
Collectors want original guns (generally) and will pass on a restored gun if original guns in the same condition are available for equal or lesser cost than your restored gun.
A lot of people do not understand this when starting a restoration project.
That said, if you want to improve *that* particular gun (which may have sentimental value for you personally) then go for it, if that makes you happy.
You said it doesn't hold that for you, however, so...
Financially speaking, you are almost always better off buying one in superior condition, and selling your current one to help fund it. Your money will go much farther towards the difference in condition that way. You're also saving time, and completely bypassing any potential pitfalls with parts availability and fitting.