I'm a bit puzzled and wonder if anyone out there knows about this. I have a movement marked Peertone, which was a Stauffer & Sons brand. There was a relationship between IWC and Stauffer with IWC watches distributed by Stauffer having the movements marked Peerless. But there's a difference between a 'real' IWC movements, which were marked "S&CO" and the Peerless brand, which were marked "SS&CO."
But what fascinates me is that my movement has a similar layout to the IWC cal 87, yet the setting lever is identical to ETA cal 710/715. The bridges on my Peerless movement don't match the ETA bridge layouts at all. So it seems to be something which is a bit of both at the same time.
There's a good article that I found on an IWC forum on this, but that dated from 2004-2009, so any new revelations most welcome.
Ranfft doesn't list the ETA movement, and neither does Eterna Fanatic. My question is: when was the 710 made? Any opinion about this movement, date of manufacture or any spare opinions out there?