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These jewels are from my very first ETA movement that I'm servicing (cal. 1080), and none of the movements I've been working on so far (Vostoks, Poljots, and a Unitas 6498) has had jewels like these. My question is simply how to oil them? They do look a lot like cap jewels and maybe that's what they are called? If I were to guess I would say that they should be oiled the same way that spring cap jewels are oiled, but I'd really like to know for sure. And, while I'm at it, what's the purpose of these non-springed "cap jewels"? I've also seen them in pictures of some really old movements having a balance without a shock spring. The movement comes from my grandfather's (born 1910) Ernest Borel Incastar which we believe he bought sometime in the early 1960-ties. It's a family heirloom, and I've been waiting to service it until having worked up some confidence. I had no idea it harboured an ETA movement so that was a pleasant and rather exciting surprise. As far as I know, it has never been serviced. As can be seen in the above picture it has a really interesting regulator mechanism, and I actually found this ad for it on eBay. Setting the rate I would assume is just a matter of rotating that five-pointed "star", but I wonder if that entire arm can be slid to regulate the beat error?