ITT Mackay Marine 3030AR and 3031A. 10KHz-30MHz synthesized, rack-mount units. AM/USB/CW; RTTY and LSB w/ optional filters. ISB with optional IF module.
The 3030 uses a BCD thumbwheel arrangement to set the operating frequency, whereas the 3031 is tuned by means of a knob/optical encoder. From the 1st IF back they're the same radio.
I managed to snag a whole bunch of 5.000 and 4.998MHz crystals and plan to build LSB filters for both of mine.
Would love to lay my hands on a 3040A and 3041A, which were delivered with both filters.