HTU "Keystone"

Savonette case (three lids), gilt metal, both lids finely gouilloché, sides decorated in relief all around, company signet on all lids, full plate concealed lever movement with external bimetallic compensation balance, plate with floral decoration, signed and numbered "KEYSTONE WATCH CASE CO. PHILADELPHIA 806057", white enamel dial with Roman numerals and small seconds, signed "K.W.C.CO." below the "12", blued anglaise hands, Ø 55.4 mm, weight 131 gr., Keystone Watch Case Company Philadelphia / USA ~1900, pressure mark on the cover, otherwise good condition with minor signs of wear, movement in working order, accuracy and duration not tested 0135