LeCroy 9300 CRT Neck Video Board. Plugs onto back of CRT, and connects to deflection / video driver board on scope. Works with any of the 93xx scopes (9304, 9310, 9314, 9324, 9344, 9350, 9354, 9360, 9361, 9362, 9370, 9374, 9384).
In excellent physical condition. New old stock, but being sold as-is - no way to test. Two versions available, labeled EC-0813030B-1 and EC-0813030B-5 on PCB. Let me know which particular board you'd like. LeCroy part number 93XX-Video.