Series 5 second model
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Front, Back, Dial, Cuvette, Case mark, Cuvette mark, Movement, Angle view of movement, 2nd view of movement

This is the second model of the Keystone Howard bridge series. In this 19 jewel example, we see the hooked ends on the small bridges that follow the straight bridges in the first model. However, there is no marking of Series 5 or the characteristic quality marks with diamonds etc. that appear on the later model. The final model would be marked with a triangle in a circle with an arrow.