: http://vintageheuer.com/modelcodeH21.htm

there are some small differences to the model photos in the "Guide to Chronos"..ie: the "lugs" connecting the dial to the strap (not sure of the technical term) seem different to the pictures posted & the late 60s catalogue, face also slightly different (seems to have track of second markers inside the main hour markers)...do you know if this is a later model?

thanks (& thanks for correcting link)
shaun