American Watch Co.
AWCo 10K 14k/8k

Image Provided by Jones & Horan

Note: Case manufacturers modified markings over time. As a result, the image above is simply a representation of one particular marking used by the company. Your case marking may differ based on the production era and other parameters.

AWCo 10K 14k/8k

The American Watch Company (Waltham) and sales agents Robbins & Appleton promoted their 10K case as being "made under Letters Patent" and that they "consist of two plates of gold, rolled together" with the exterior solid 14K and the interior solid 8K. This process is generally referred to as "double-stocked." When these cases were first introduced, they were typically marked with an embossed "A.W.Co." in an oval without any further indication as to gold content (distinguished from the 14K and 18K solid gold cases that are marked indicating the gold content). Cases produced later featured a stamped fancy banner with the word "Waltham."

While neither the inside or outside are solid 10K gold, the case, in its entirety, would assay to 10K. This is similar to the "Wheat" grade case manufactured by the Brooklyn Watch Case Company.

1886RA: [Robbins & Appleton Catalog, General Agents] "Our 10 karat gold cases are made under Letters Patent, owned by us and consist of two plates of gold, rolled together, the outer or wearing surface of 14 karat, and the inner or unexposed surface of 8 karat, the two plates when melting together assaying 10 karat.

This mark should not be confused with the similar mark used on later gold-filled factory-cased watches in the Colonial Series (manufactured by the Crescent Watch Case Company).

Database ID:	PWDB-345
Case Grade:	AWCo 10K 14k/8k
Material:	Gold
Gold Content:	14K/8K
Note:	Double Stock 14k/8k. Waltham's 10k gold cases are typically marked with the embossed "A.W.Co." inside an oval with no other indicators for gold content or "Waltham" inside a fancy banner. 18s Approximately 36-42 dwt.
Patents:	#289340
Marking Variants: (Not Intended to be Comprehensive)	Image Provided by Jones & Horan
Original Advertisements:	Description of Double-Stock Case Source: 1886 Robbins & Appleton Catalog
Catalog Sources:	1877DFC 1878CYC 1880GHR 1880JAB 1880NHW 1882SFM 1883GHR 1883UNK 1884LSS 1885OY 1886HMS 1886RA 1887BHIA 1887LAM 1888BA 1888OY 1889BAM 1889EVR 1890AP 1890BA 1890CHK 1890JC05 1890OY 1890SFM 1891RR 1891SAC 1892ACR 1892BAC 1892CPS 1892WES 1893BFNA 1893BHIA 1893MCE 1893SAC 1894BA 1894BATM 1894NRC 1895OY 1895SFM 1896MF 1896OY 1897BB 1898MLMF 1899ACB 1899BHIA 1899SAC 1900BA 1900BHIA 1900LMC 1900NHW 1901BAC 1901OY 1902ACB 1902BATM 1902BB 1902MF 1903ACB 1903BAC 1903FDW 1903N76 1903ON 1904ACB 1904BA 1904LB 1904PWC 1905ACB 1905BAC 1905DH 1905FNCS 1905ON 1906ON 1906SRC 1907ACB 1907JVF 1907NAC 1907NBC 1907SFM 1908ACB 1909BAC 1910ACB 1911NG 1911OY 1911WJJ 1912COC 1912HA 1912NG 1912SFM 1912WJJ 1913FDW 1914ELD 1915ACB 1915ON 1915PWE 1916LCM 1917BA 1923CBN 1923ON 1925ASJ 1925CPS 1928ON 1932ON 1942WAG