Introducing – The Roger Dubuis Excalibur Biretrograde Calendar in Steel
Last year, Roger Dubuis unveiled the Excalibur Biretrograde Calendar, a revival of a signature biretrograde complication co-patented by founder Roger Dubuis and Jean-Marc Wiederrecht (Agenhor) in 1989. Although this calendar version is simpler than the double retrograde QP the two men developed,...
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