Here are a few Gew 88 clip markings, first one is a circle M stamped one from 1933 (Czech)
Next is a "D" marked, a single slash marked & a "W" marked clip
Next we have three with unusual markings one with two slash marks sideways, one marked with an "X" & one that looks like an I with two "J's" joining the I.
If any members have any other marked en-bloc clips please post them.