Welcome, Pete, here's the good news: The color you describe--and it does show in your photos--is correct for your commercial. It's called "straw", and is applied to the parts by heat treating. Search the site for threads about this to learn more!
The side plate should be rust blued to match the rest of the pistol; however variations in the hardness/alloys of different areas of the gun are said to affect the tone of the rust bluing, and over time different components can become different shades or hues.
Here's the bad news: Though the 7.65 Luger is sweet to shoot, you'll find that the ammunition for this caliber is difficult to find, or expensive, or both.
David Parker
p.s. I agree with Ron about the smokiness of your deal!
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