The 501-27512-62 from Wenzel Associates is a OCXO with Frequency 100 MHz, Supply Voltage 12 V, Phase Noise -125 dBm/Hz@100 Hz to -95 dBm/Hz@10 Hz, Phase Noise 1 kHz -150 dBm/Hz, Phase Noise 10 kHz -165 dBm/Hz. Tags: PCB Mount, OCXO. More details for 501-27512-62 can be seen below.