Information about Etalon clocks
This is what I know about current existence and location of Etalon Clocks - any others?
| Serial Number | Initial Location | Current Location | Notes | Owner |
| #6 | ? | UK | ||
| #21 | Novosibirsk | USA | ||
| #23 | Novosibirsk | UK | ||
| #26 | ?? | USA | Telescope for amplitude | |
| #27 | ?? | Last seen Russia 1990's - Germany now? | Telescope for amplitude |