Hi,
The coil spring was introduced in 1904 and it first appeared on technical drawings dating 1904. Although the drawings of the first coil spring version show 'the dutch variation', it's doubtfull that the Dutch had any influence on the design. More likely, Georg figured out that the leaf spring was a flawed design element and already started correcting it, amidst the Dutch trials.
The pistol shown on the 1904 drawings is basically the '1906 model'.
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