These are the famous 556 BO-ACs used in the Wurlitzer 3600, 3700, 1050, and 7500 model machines. 

The photo shows the option program card (not included - we were testing this unit) 138442-x for the number of plays per coin as well as the extra jukebox feature such as LP and/or Top Tunes.

These are As-Is working, not overhauled, but they are burned in for a few hours prior to shipping.

I recommend that the 5VDC power supply is replaced with a 7805 single regulator IC device (TO-220 case style) along with the electrolytic capacitors due to old age. If you want us to upgrade the BOAC there will be an added cost of $75USD for parts, labour, and testing - select that option if so desired.