White shadows get a bit less interest at the moment so not a lot of information out there. Give it time and someone will start looking into them or Hodinkee will write an article on it and boom everyone will want one.
They are quite common, pop up quite a bit on eBay and not very expensive. The cal. 66 is one (perhaps) the thinnest UG microtor iteration. I think
@Carlton-Browne has one or two.
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