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It is a pulse generator using an GR-874 50-ohm output connector and has a specified rise time of 250ps. Pulse width can be programmed with a external 50 Ohm cable through two GR-874 50-ohm connectors.

The special feature of the device is, that the switching action is made directly be a mercury-reed contact. Frequency and life time was therefore fairly short. About 600Hz and 200 hours. So, forget to shut down over weekend and some holy-days, needet a replacement of the reed switch.

If there are some spare reed/contacts, please let me know. ;-)