The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Degree. Hunting 50 Old Model 5 New Model 23 Key Flat Hair F. Hair Breguet 50 42 50 42 Open Face 50 Hunting ......53 Half Plate. 388 HALF PLATE. A watch in which the top pivot of the fourthwheel pinion is carried in a cock, so as to allow of the use of a largerbalance than could otherwise be used, HALL MARK. The stamp placed upon articles of gold and silverafter being assayed hy government officials. The United States govern-ment does not employ hall marks, but artic
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Degree. Hunting 50 Old Model 5 New Model 23 Key Flat Hair F. Hair Breguet 50 42 50 42 Open Face 50 Hunting ......53 Half Plate. 388 HALF PLATE. A watch in which the top pivot of the fourthwheel pinion is carried in a cock, so as to allow of the use of a largerbalance than could otherwise be used, HALL MARK. The stamp placed upon articles of gold and silverafter being assayed hy government officials. The United States govern-ment does not employ hall marks, but articles can be assayed by theproper officers, and a certificate of their standard given upon payment ofa small fee. The hall marking of watch-cases is not compulsory inSwitzerland, unless they contain some stamp indicating their quality,and the English and other hall marks are recognized. In Great Britainwith few exceptions, the hall marking of jewelry is optional with themanufacturer, but all gold or silver cases made in Great Britain or Ire-land must be marked. The hall marks for Switzerland are shown in. I8k or .750. 14k or .583. GOLD. Sterling or .935. SILVER. Fig. 160. Fig. 160. Hall marks are not alone useful for determining the qualityof goods, but are also a great aid in determining the age of watches, hall mark of Great Britain consists of several impressions in separ-ate frames or shields; the quality mark, the office mark (which designateswhere it was stamped), year mark, and if duty is chargeable, the head ofthe reigning sovereign. The standard or quality mark for London andBirmingham is, for gold, a crown, as shown in Fig. i6i, and i8 or someother figure to designate thecal at. The standard mark for 22 carat gold prior to 1845 was a lion passant,which is now used as the qualitymark for sterling silver. The qualitymark for 15k. gold is 15 or .625, forFig. 161. J2k. is 12 or .5 and for 9k. is 9 or .375. The decimals indicate the proportions of pure gold of 24k. i
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