Lancaster Watch Co. Keystone Production Charts

Note: Production dates are estimations but should be accurate within +/- 3 years.

Grade	Production	Runs	Lowest	Highest	Start	End	Profile Code/Image
Keystone	6,100	8	4,001	35,300	1879	1883
	1,100	2	4,001	24,600	1879	1881	18s-M1-15j-AGK-U-No. 7
	500		4,001	4,500	1879
	600		24,001	24,600	1879	1881
	1,100	3	4,501	35,300	1879	1883	18s-M1-15j-AGK-ATI-No. 7
	700		4,501	5,200	1879
	100		27,001	27,100	1879	1883
	300		35,001	35,300	1882	1883
	500	1	10,201	10,700	1879	1879	18s-M2-15j-HGL-U-No. 4
	500		10,201	10,700	1879
	2,000	1	19,001	21,000	1879	1879	18s-M2-15j-HGL-ATI-No. 4
	2,000		19,001	21,000	1879
	1,400	1	24,601	26,000	1879	1881	18s-M2-15j-HGP-ATI-No. 4
	1,400		24,601	26,000	1879	1881

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