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Question:

In thin sections, what is the phenomenon that leads to recrystallization and undulatory extinction of quartz?

i mean what is the reason for the development of these observations. Is it the stress or fluid activity or what?thank you

Answer:

Vintage?
Hermle Quartz 2100
This Site Might Help You. RE: Is this vintage clock worth anything? Hermle Quartz 2100 - Antique? Is this vintage clock worth anything? It is a Hermle Quartz 2100. The side of the styrofoam has a sticker that says H-44605 not sure if that is the model? Clock is brand new in the box. Box is a little worn from sitting on the shelf. Here is a picture of the clock for reference...
Hermle Quartz 2100 appears to refer to the movement - the insides of the clock. It is actually the basic non-chiming model and far from being antique (which, incidentally, actually refers to things over 100 years old) is described by the company as being contemporary and is still in use today. I can't actually find the model you have but secondhand clocks with this basic mechanism are selling on the Internet for between ?5 and ?25.

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