A book entitled George Nelson in the Compact Design Portfolio series succinctly summarizes its subject’s career in words and pictures. Original Nelson/Harper/Miller clocks are available from dealers who focus on vintage items. One of them, Evan Snyderman of R 20th Century ( www.r20thcentury.com / 212-343-7979), says prices range from less than $2,500 for the most common to the mid-five-figure range for rare ones. Replicated models are available in what Vitra ( www.vitra.com ), the replicas’ high-end European manufacturer, calls re-editions; they combine characteristic good looks with quality, authenticity, and the accuracy of quartz movements.