Hi,
FWIW, the Dutch used both the magazine with the spring-catch (bad idea

) and the 'normal' pinned version. Both nickle with wood bottoms.
My 1906 Dutch came with a normal one-pin nickle magazine (unnumbered) and a blued one-pin magazine (unnumbered). Both with wood bottoms.
The pictures show now. And this pistol has a slight problem.
The DWM deliveries went from 1 to 4181 (serial number).
The Vickers from 4182 upwards.
So this one has a serial number in the Vickers range and a DWM toggle. Could well be an arsenal repair. I'd rip it apart and check for G.S. markings everywhere.