Up for sale is a Icarus Instruments  Model  3000-U  Mode C  Serializer  P/N 3230015-3 Technical info is as follows:

P/N:  3230015-3

S/N: None

MODS: None

Volts: 13.75  27.5 VDC

The unit was in working condition when removed.  If you have any questions, please feel free to ask! Happy buying!