Alf,
You need to read my last post carefully. You will see that although #5 and #6 were initially the same, #6 was modified to make it lighter and have a manual as well as a grip safety. The manual safety is a sliding button on the grip safety. In the position shown, the manual safety is "off" and the grip safety can be depressed. When the manual safety is slid upward, the button on it is blocked by the frame and the grip so that the grip safety cannot be depressed.
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If it's made after 1918...it's a reproduction
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