I’m hoping someone may be able to shed some light on this interesting Negus timer. The center sweep records seconds to 1/300 sec, the bottom dial shows the oscillation of the balance and the top dial records minutes. The timer is started by depressing the button on the side and can be held running via a lever that is placed over the button. There is no flyback provision. Currently the balance oscillates between the 10 and 50 indicators. There is significant tarnish on the tub indicating it has seen a lot of use. The bezel measures 4” across. The tub is typical of chronometer tubs of the 1800’s. The spotted dameskeening looks mid to late 1800’s. The engraving on the dial suggest the 1800’s also.
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