From a friend of mine I recently received a Teac A-3340S in good condition. Here is a picture of it:
My friend had just acquired it and asked me to take a look at the levels and to do an overall adjustment of the deck for him. This is I believe the first 4-track quadro deck by Teac, introduced in 1973. The deck is very very heavy and very very well built. This particular deck is also very well kept, there are no signs of usage and it looks like it has just come out of the shop. Remarkable as this deck was in production from 1973 until 1978.
After I serviced it, it sounded wonderful! It was a pity I had to return it to my friend, but well, it was his deck.