10K YELLOW GOLD FILL WITH A VERY NICE FANCY BACK. HE BACK TIGHTENS UP SQUARE AS SHOWN. THE THREADS ARE VERY GOOD.BEZEL AND BACK COVER BOTH THREAD EASILY AND SEAL NICE. THE BOW WILL HOLD ANY POSITION AND THE CROWN IS CRISP AND SHARP. VERY NICE CLEAR ORIGINAL STYLE MINERAL ACRYLIC CRYSTAL. The item "16S 10K YGF J BOSS Fancy Back Mainliner Style Case for Hamilton Illinois and etc" is in sale since Monday, October 8, 2018. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "emmet1923" and is located in Townshend, Vermont. This item can be shipped to United States.