Bob,
You have a Model 1908 Commercial. You are correct that the gold colored parts are a heat treatment that provides a moderate case hardening. Collectors refer to this as "straw" colored, and it is correct for your Luger. It appears that you have a fairly nice example and more photos would be appreciated. There really isn't any harm in disclosing the actual serial number and it would help to add to the data base on these guns, but if you choose not to share it that is understandable.
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If it's made after 1918...it's a reproduction
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