To me the above image looks machined, not stamped. You can see the chatter of the cutter and the slight wavy path, particularly at the inside tip, and at about 10 o'clock as it comes up around to the top, caused by the sheet material moving slightly. The picture Pete has is of more contemporary dials, which were higher volume production, where it made sense to make tooling. The Pre-Vs were low volume, it made more sense to pay a higher part price but not have to pay for tooling, they were only selling small batches. This would mean that the variation in indice thickness is easy to explain, every time they did a batch they had a different cutter, possibly even replacing them within batches. You are talking less than 0.1mm between a 'thin' indices dial and a 'thick' one, so cutter wear, cutter tolerance, or even 'Damn, broke a 0.7mm cutter, have a 0.8mm, it'll do, no one will notice' comes into play. Small company QC in Italy for tool watches, not Swiss luxury QC... Factor in 'painting over the lines' and thickness tolerance goes haywire. Another thing that is interesting on thick indice dials: sometimes you can see where the cutter goes from the top of the '6' in towards the middle, and gets so close to the edge it leaves a tiny sliver of metal, which gets pushed slightly into the vertical part of the 6. Couldn't be done by stamping, and shows they machined the '6' and '9' from the outside in...