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The one that is stainless steal.
I have a full set of WM A. Rogers AA heavy Oneida LTD. Flatware... It says on the back of the knives "STAINLESS". I hope this answers your question. I have a similar set of flatware and the "Stainless" on the knife means the blade is stainless. However, the handle and other parts of set could be stainless or silverplate. WM A Rogers did mostly silver plated flatware, not sterling silver. If it tarnishes it is most likely silver-plated.
This is not going to be easy to get rid of. You are more than likely going to have to sand down the stainless steel.
All stainless is not created equal. For surgical-quality stainless least likely to rust, get 18/10 stainlees steel. A lower number before the 10 is lower quality .
A stainless steel screen is less likely to rust than an iron screen. However, given the proper conditions, the coating on stainless steel can be eroded, which will make it possible for it to rust.
Real silver is much shinier than stainless steel, which is typically what consumers purchase as silverware. Unless your silverware is only used for special occasions, you are most likely using stainless steel.
castiron
The Model 39-2 was never made in stainless under that name. You most likely have a a nickel 39 or a 639.
high thermal expansion
No. A metal spoon is most likely made out of stainless steel, which is a complex group of elements.
Stainless steel is an alloy that contains both nickel and chromium. Both of these metals are naturally stain and rust resistant.
Stainless steel is most likely the answer you are looking for, as it is arguably the most common material, but not the only one, fitting this.