|Serial number||NMI-27"NMI" can not be assigned to a declared number type with value -27.|
- 27. NMI. Brass case is solder sealed. White metal cap is press-in and contains molded rubber preform stamped with numbers 155. The numbers 7 62 are stamped on side of case at bottom - possibly a date stamp. Unit was originally enclosed over top and partially down the side with orange molded rubber, which disintegrated during the cleanup process.