One cannot rely on the hallmark alone to date a watch since cases and movements can be interchanged. Some knowledge about the design and development of watches is also required.
The following will help with dating a watch:
Arcaded dial Unlikely to be later than about 1780
Lever escapement Very rare before 1815
Engine-turned case Rare before 1830
Arabic chapter-ring Mostly 1790-1810
Flat (rather than convex) dial After 1800
Subsidiary seconds dial Very rare before 1800
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