I was hunting around for information when the Vaduz change was proposed and while I didn't find anything related to Vaduz specifically, I came across these very nice historical German documents that may be of use to others. The first from a watch-makers journal in 1916 with many pages discussing the adoption of "summer time" that year and reservations about it. There are mentions of those who proposed the legislation, etc. for anyone who can read German and feels like digging through the various pages talking about it. This is the most relevant page (but there are many others -- search for Sommerzeit): (Page 131) http://babel.hathitrust.org/cgi/pt?id=nyp.33433090896915;view=1up;seq=145 The second discusses WET / CET in terms of railroads and contains an interesting snippet regarding CET being authorized since 1 Feb 1920 as well as Netherlands being 20 minutes offset from GMT. I can't find mention of 1 Feb 1920 in the database, so I'm not sure what it is referring to or if this is new/known information. Also, the database says that railroads did not observe the GMT+0:20 in Netherlands, yet this is a railroad journal specifically mentioning it. (Page 84) http://babel.hathitrust.org/cgi/pt?id=njp.32101066879451;view=1up;seq=98 Just leaving these here since some may be interested. Make sure the links leave you on the page # indicated -- sometimes Hathi jumps to an incorrect page. -Andrew