Hello John & Gerben,
I think on a 1900 AE, the "polished" area of the safety would be visible when the lever is in its upward position...since this is a grip safety model...it should not have "Gesichert"...at all...in either the upper or lower position.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />