we are searching:

Axtal Axiom45HS 05 OCXO 10 MHz Sinus, 5 V, new or used datasheet stability 0.5x10^-10or
MTI 260 Series OCXO 10 MHz Sinus, 5 V, new or used datasheet stability 2x10^-10 or
MTI 270 Series OCXO 10 MHz Sinus, 5 V, new or used datasheet stability 2x10^-10

Every hint is welcome.