I hope it's my diminishing eyesight and the lighting in your photos but I seem to detect a very slight yellowing on your Python's frame which is indicative of nickel plating.
Proof of stainless steel is a stamped capitol letter "S" and can be found in two places. Under the ejection rod on the hollow lug and under the ejection star on the ejection rod bushing.
Proof of stainless steel is a stamped capitol letter "S" and can be found in two places. Under the ejection rod on the hollow lug and under the ejection star on the ejection rod bushing.

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