Lancaster Watch Co. Pocket Watch: Serial Number 4900 (Grade Keystone)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/lancaster-watch-co/4900/movement

Access Date: December 21, 2024

We noticed that you entered a relatively short serial number.
"4900" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.

From the American Horology Archive:

Lancaster Watch Co.

Grade: Keystone

Manufacturer:	Lancaster Watch Co.
Manufacturer Location:	Lancaster, Pennsylvania
Movement Serial Number:	4900
Grade:	Keystone
Variation:	No. 7
Model:	1
Estimated Production Year:	1879
Run Quantity:	700
Grade/Model Run:	2 of 5
Grade/Model Total Production:	2,200
Variant Est. Production:	1,100 (18S-M1-15J-AGK-ATI)
Size:	18s
Jewels:	15j
Movement Configuration:	Adaptable
Movement Finish:	Gilt
Movement Setting:	Key
Plate:	3/4 Plate
Balance Type:	Expansion
Train:	Quick
Regulator:	Mixed
Adjusted:	Yes
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Movement Markings:	Keystone Lancaster, Pa. Safety Pinion Click In Out Adjusted
Case:	Various
Run ID:	7.G2.18S5.181M2.A2.K2.15J2
Database Version:	v52.516
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	6.62
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	48.78
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	0.967%
Registry Population: Scoped for This Run Only	14 (2.00%)
Research Note: #5180: Bitner Regulator. #5054, #5180, #4689, #4975, #4760, #4809, #4676, #5060,#5181: Marked "Adjusted"

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Production Metrics Tree: Grade Keystone

Target Profile: 18S-M1-15J-AGK-ATI-NO. 7

Lancaster Watch Co. Grade Keystone (All Variations): 6,100 ETP
18S: 6,100 100.00% 18s, Grade Keystone
18S-M1: 2,200 36.07% 18s, Grade Keystone, Model 1		Other: 3,900 Other Models or Unclassified
18S-M1-15J: 2,200 36.07% 18s, Grade Keystone, Model 1, 15 Jewels
18S-M1-15J-AGK: 2,200 36.07% 18s, Grade Keystone, Model 1, 15 Jewels, Adaptable/Key/Gilt
18S-M1-15J-AGK-ATI: 1,100 18.03%	Other: 1,100 Other Adjustments or Unclassified
18S-M1-15J-AGK-ATI-NO. 7: 1,100 18.03%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 14 watches in the population registry for this run with 7 images. Create a FREE account or login to view the population registry and add your watch to the registry. Create a Free Account

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Verification Reports for this Run

The following reports have been graciously submitted by dedicated members in reference to this production run. These reports are useful to verify data and track inaccuracies that require further research. Please note that reports may contain inaccurate information or assumptions that must be dilligently considered with other available sources.