All the springs shown have a foot on the longer leaf, albeit it is a bit smaller on the disassembled mainspring. Both leaves are the same thickness on a 7.65mm spring. For the 1902 9mm spring, the long leaf is approximately 50% thicker than the 7.65mm spring but the short leaf is the same thickness for both calibers.
I will measure the thickness of the spring steel and get back to you.
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If it's made after 1918...it's a reproduction
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