The QR-MV-379 from Morion US is a Space Qualified Oscillator with Frequency 420 to 550 KHz, Temperature Stability ±3 ppm, ±5 ppm, ±7.5 ppm ±10 ppm, ±15 ppm, ±20 ppm, ±25 ppm, ±30 ppm, ±40 ppm, ±50 ppm, Operating Temperature -60 to 85 Degree C. Tags: Chip. More details for QR-MV-379 can be seen below.