It's...

...The Model 175 Universal Programmer. I recently got hold of this nifty bit of lab gear but it arrived DOA. Today I completely dismantled the unit to access the switches which in turn also needed to be completely dismantled and then cleaned. The cleaning worked a treat and also fixed another little problem with the Tilt indicator. Once reassembled, I had it running an arp sequence for a few hours synced to an external master clock (which is exactly why I bought it in the first place).