I need some help from you, dear Zenith experts at our forum.
Do you have any information and pictures about early Zenith Compur ss with stepped case at 38mm?
Well Röslers book will be my christmas gift, but I hardly can not wait until then.

I just found two very early Compur chronographs like that at my research, but both from Universal Geneve.
Already know the epic and beautiful Zenith/UG threat at WUS and that they worked together in the early 1930.
Found on awesome example in gold from UG at Bernardini Milano
and an other from Dr. steel at Instagram.

So if you have further information & mabye some pics, I would be glad for sharing them here.

Best regards
Georg