Here's a compact low-profile high-mass double-oven 10.0543478 MHz oscillator.

Photo

Pinouts

Based on the label one can assume:

• Pins 2 and 3 power the oscillator (about 11 mA at 15 V).
• Pins 4 and 5 power the oven (about 700 mA at 25 V falling below 200 mA after a few minutes of  warm-up).
• Pin 1 provides a stable voltage output; probably for use into pin 6.
• Pins 7 and 8 are monitor outputs.

For minimal testing one only needs pins 2,3 and 4,5.

Performance

After a week of warmup here is the performance of a new FE-2163A.

FE-2163A #2 showing 8E-13 stability at tau 1 s.

Another FE-2163A I tried has worse performance.

FE-2163A #1 showing 2E-12 stability at tau 1 s.