|Serial number||NMI-5"NMI" can not be assigned to a declared number type with value -5.|
- 5 & #6. NMI. Two units of same construction with sealed basic unit shown in center. The numbers 3020-1128 is stamped on top of#5 and the numbers 3020-1802 on top of#6. Spike on #6 has raised numbers 5310 on bottom of spike base. Case top of #5 had been anodized or painted for visibility during recovery. Base plate provides for cable entry and two holes through which a carrying rope is attached.