Limited Edition of 999 Pieces. Ball Watch Company Engineer Master II Doolittle Raiders Limited Edition NM3500C-S1-GRR. Legibility is of upmost importance in any military timepiece, thus we have opted for a minimalistic approach for the Doolittle Raiders series. On the dial, the hour markers and hands are equipped with the baton-shaped micro gas tubes, creating a clean yet eye-catching design. The revolutionary micro gas tubes shine automatically without any form of charging and provide stellar luminosity no matter how dark it becomes. In the Doolittle Raiders series, we offer 2 choices of micro gas tube colors: a unique rainbow colorway or the classic combo with green, orange and yellow. Different styles, same consistent brightness.