English gold Savage two-pin lever pocket watch Circa 1833

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An English 18 carat gold hunting cased Savage two-pin lever pocket watch made by James McCabe, Hallmarked London 1833. Gilt ¾ plate key wind movement with fusee and chain, Harrison’s maintaining power, a plain cock with polished steel regulator, diamond endstone, plain three arm gold balance with blue steel spiral hairspring, Savage two-pin lever escapement and escape wheel pivots with end stones. White enamel dial with Roman hour numerals, outer minute divisions, subsidiary seconds at 6 o’clock and gilt spade hands. The case with an engine turned back, a reeded band and maker’s marks TW and IM, the number corresponds to that of the movement. Dial and movement signed and numbered, case numbered.
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Diameter: 49 mm
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Depth: 7.5 mm
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Signed: Jas McCabe Royal Exchange London
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A Savage two-pin is a form of lever escapement named after George Savage, in which the roller carries two pins which unlock the escapement through the fork. A third pin, mounted upright at the end of the lever, acts as the impulse pin, passing into a narrow notch cut in the roller when the escape wheel has been unlocked. This third pin also serves as the guard pin for the safety action during the supplementary arc. Savage introduced his escapement about 1814, certainly before 1818, when he emigrated to Canada. There, he founded the firm of Savage & Lyman. Very few watches signed by Savage have survived.