" A Pictorial View of American Watchcase Factories," Andrew H. " The Star Watch Case Co., Jack Linahan, NAWCC Bulletin, No. Niebling, Whitmore Publishing, Philadelphia, PA, 1971. History of the American Watch Case, Warren H. Back issues of the NAWCC Bulletin are also available online to NAWCC members who are currently logged in. ReferencesThe following books, and NAWCC Bulletin back-issues, are available to members on loan by mail from the NAWCC Lending Library, using the Lending Library Form. See the Case Material Encyclopedia article for an explanation of the terms. Gold-Filled case, guaranteed for 10 years prior to 1924, 10K Rolled Gold Plate thereafter. By 1941, however, Hamilton rebounded with tremendous success with sales nearly reaching 9,000,000. Indeed, many of Hamilton’s rarest and subsequently, most desirable watches come from this period. Gold-Filled, guaranteed for 10 years around 1906 decades later, chrome plated base metal In 1932, sales fell to 1,558,000 and sales of watches were at a lull. Gold-Filled, guaranteed for 20 years as late as November 1906, 25 years by April 1909
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