If someone wants to pay that much! The datum rubidium standard the 8040 is even older than the one I got recently but one nice thing is it has multiple outputs on the back... I can't quite read the value in the picture though.
1 and 4 looks like 10MHz but 2 and 3 are something shorter... maybe 5 and 1? Also the lock light isn't on.
The 4040A looks idk now... the lock light is on but half the connectors are missing and there's stuff taken apart so what does that mean? It's very similar to my unit but has the switch for storage and normal. Looks like someone wrote 10 next to the one output left on the back. It's a gamble but could be something maybe.
Tempting to be honest but I just bought an HP3458A this weekend so maybe I shouldn't risk it
Bill