Interestingly, it appears that there are at least three different clip variations. If one were to open the knife and hold it out in front of you with the edge down, the clip will either have SWISSMADE and the Patent info "upside down" (as it is on my knife), that information will be "rightside up" (i.e., you can read it normally with the knife held in this position), or the clip will have the bug on it with the writing "rightside up." So from now on I'll also try to include which way the writing goes when I list the clip info.
I did a quick image search and came up with the following:
#428 (on sale now at AG Russel's Cutting Edge) -- no Klotzli on the blade, matte scales, combo edge, and the clip isn;t visible in their one pic
#1371 -- No Klotzli on the blade, glossy scales, bug on the clip, plain edge
#1701 -- no Klotzli on the blade, glossy scales, bug on the clip, plain edge
#210 -- Klotzli name is on the blade, glossy scales, plain edge, and clip engraving is "upside down" with no bug.
#478 -- no Klotzli on the blade, matte scales, combo edge, clip not visible in the pic I found
#758 -- no Klotzli on the blade, matte scales, plain edge, clip letter is "rightside up" but no bug
There are lots more shots of this knife, but it's amazing how many on which I cannot make out the serial number. I'm wondring if the rarest variation may turn out to be the ones with the clip writing "right side up", but no bug.