50870, 50871
My 4310 WX's, which I traded in 1977 for two L-65's.
(I still have the 4310's)
They (all four) were purchased from Warehouse Sound, A JBL PRO dealer in San Luis Obispo, Ca. I talked a guy at work in S.L.O. into trading them; Once I got the Jubals home ($800 new), I never cared much for their sound!