Cartier

I humbly submit this as the answer - a 1916 Cartier Santos in platinum and a recent Santos 100. This particular vintage Santos is in platinum with a yellow gold snap back; all Santos of that vintage had gold backs, regardless of case material. It measures...  

Original design a litle bit larger ; as they did with the Santos Dumont 1914 limited edition in the collection privée...it is such a nice design !

or do the numbers on this Santos Dumont look a lot thinner and more stretched that the Santos Dumont 1914? GEO

They look indeed a lot skinnier then on the Dumont 1913. Perhaps a minor adjustment made by Cartier to give the watch more body?

Probably for aesthetic reasons as MartinGreen suggests. - SJX

No message body

but so did the CPCP version, a little larger and bolder, but what a gorgeous Minute repeater that was. GEO

This is the second generation Tortue repeater with the Renaud et Papi movement. - SJX...  

Well have I said to much. Dream watch! GEO