One leaf (the long one with the hook on the end) of the compound 9mm spring was 50% thicker than the regular 7.65mm spring, which has leaves of equal thickness. The carbine has the same spring as the other 7.65mm 1900 Lugers, but had a helper spring in the forestock to assist in bringing the action back into battery.
Ron
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If it's made after 1918...it's a reproduction
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