C = Combined set. The WE 302 model, for instance...the first WE model that COMBINED the handset, switchhook, network (hybrid coil) and ringer.
CV = Combined set with a VARISTOR across the receiver terminals. (the 500-series) A varistor is a little component whose resistance decreases with an increase in voltage across it. It reduces acoustic shock (clicks) caused by switchhook and rotary dial operation.
CVW = As above mounted on the WALL.
KV = KEY set
KVW = WALL key set, aka "Cuckoo Clock"
6xxx keys = a whole family of separately-mounted keys. The 604x series has the same key as found in the KV, in a plastic cover. HOLD, plus 5 pickups.
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