Just to add to this thread, here is the original T-19 dome on my 5512, 3.7 mil. Looks a little taller than some of the other domes on this thread that are also said to be original T-19s, but seems very close to the shape of the T-19 on the beautiful gilt 5513 posted by Southtexas.
The shape of the insert can have a visual impact, of course, especially if they flatten out, and then there's polishing that can change the shape over time.
I've also read that the original T-19s (not service crystals) actually changed slightly through the years, so that could also account for some subtle variations.
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