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I suppose this will add to the confusion I have a roller jewel assortment. It lists out American pocket watches for Elgin 18 size and even 16 size it's a 50. But not all the various companies used 50-50 does seem to be common one company had a 51 and the smallest is 43. American parts are always interesting? Francis Elgin for mainsprings will tell you the thickness of the spring other companies will not even though the spring for the same number could come in a variety of thicknesses. But if we actually had the model number of your watch we would find it probably makes a reference that the roller jewel came in different dimensions. So overlook the parts book we find that? So it appears to be 18 and 16 size would be the same sort of the arson different catalog numbers and as I said we don't have your Mongol know which Log number were supposed to be using. Variety of materials garnered her sapphire single or double but zero mention about diameters. Then in a section of rollers in this case rollers with jewels we do get this down in the notes section Roller specifications but of course zero reference to the jewel size. I was really hoping the roller jewel assortment would give us sizes it doesn't really. But it does show a picture of how one particular roller jewel gauge is used  -
By Neverenoughwatches · Posted
Seems to still do it through my mobile data, I use an android phone almost exclusively, but I'll double check it. Thanks mark Strange, I'll try my laptop that utilities edge. I've been on site half hour since I got home, it hasn't done it yet. Thanks John -
By RichardHarris123 · Posted
At work, I'm on MS Edge, not through chose, on my phone, chrome, no issues with either. -
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Oh I didn't think of that. I measured my roller jewel gauge with a screw micrometer and it is all over the place. The 46 measures at 49, 44 -> 46, 42 -> 43, 40 -> 40(!) on the nose, 38 -> 38, 36 -> 37.... So most of them are 0.01 to 0.02 larger than labeled but some of them are not so I have learned this gauge is unreliable and I need to measure it when I use it. Still my jewel is 42, my gauge at 44 (actual 46) just fits in the slot without binding so maybe I will try going up a size if I have one.
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