Internet Horology Club 185
Question on bulls eye crystal

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https://ihc185.infopop.cc/eve/forums/a/tpc/f/1086047761/m/2863966677

January 14, 2013, 15:04
Peter Kaszubski
Question on bulls eye crystal
What will the bulls eye crystal be use on?
January 14, 2013, 15:54
Francesco Marco Maraschin
I've seen a couple of English fusees with bulls eye crystals.
January 14, 2013, 15:58
Peter Kaszubski
That's right now I remember thanks Francesco.
any other use?