200e

i think you're probably seeing the version that came out just prior to the introduction of the 200e:

http://www.silentspring.net/pix/297.jpg

if you don't have luck here or from Buchla, you might check out electro-music.com, someone on that board occasionally puts together group buys for the Rogan knobs.  i know they've done one for both the large & medium variety (both in blue).