Grade 510
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Front, Back, Dial, Movement, Case mark, Cuvette, Cuvette mark, Angle view of movement, Pillar plate mark closeup, Diamond end stone closeup, Hidden hinge closeup

The grade 510 looks a lot like the grade 410, but has some distinctive differences. Among these are the internal jewelling on the barrel rather than the visible jewel on the 410 and the diamond end stone on the balance. The diamond end stone places the 510 in the august company of the Diamond, Ruby and Sapphire and the highest grade of early Sangamo Specials. It would be interesting to know whether the 510 sold for more than these other examples.

There is only the model 4 open face version of the grade 510. It was made in 11 runs between 1911 and 1918 for a total of 423 examples. It is listed in Russ Snyder's Illinois database as being marked 5 or 6 positions. The two examples I have are both marked 6 positions.