Canadian numismatist Douglas Andrews describes the pieces as “stunning in their use of proposed color schemes, vignettes, and different designs, many of which look contemporary even by present standards.” He considers the bound volume containing an assortment of 3,500 different trial and proof notes from the late nineteen-forties and early fifties as the largest single offering of color proof notes ever.
For date-based guidance, see Raskin, M. (2013), “The Effects of the Federal Reserve’s Date-Based Forward Guidance”, Federal Reserve Board, Finance and Economics Discussion Series, No. 2013–37. 7 Back in 2006, then ECB President Trichet noted that “the ECB does not embark on a particular multi-monthly  pre-commitment on interest rates or on the path of future policy interest rates”.