I own two Enicar Sherpa Graph watches, one of which easily opens with a friction ball or a Bergeon suction/friction tool.
. . . and the other S.G. I can not open.
The one I cannot open is now in the hands of a well-known and respected watchmaker here in the U.S. and in my presence, he was unable to open the watch even with a Bergeon 5700Z and appropriately sized friction cup.
The watchmaker has a large commercial 3D printer and two CNC machines one of which is a milling machine. The current plan is to print a tool out of plastic first and if that fails, then to make a tool out of metal.
The case back is 14-sided and I measure it as 34.0mm flat to flat and 34.7mm corner to corner.
Shown below appears to be the original type of tool used:
I have looked online on and off for a couple of months and I have not run across such a tool.
There are multi-sided dies made for Breitling watches that would be just the ticket if they were made in the appropriate size, but alas, the 14-sided variety come in 30.2 and 36.2 flat to flat sizes.
I've checked with Esslinger, Otto Frei and others.
Anyone have any idea where I may obtain the correct tool for the job?