Anyone recognize this?

Looks like '67-'69. Comes in 2 parts, the valve/bracket and the vacuum cannister.
The valve is available from a couple places (old NOS stock, a bit pricey; but available), but no luck so far on the vacuum cannister. If it is good on your unit and just the valve is frozen up, you may be in luck and can just swap the pod.
NOS Mopar A/C Water Valve 1968-9 Plymouth Dodge A Body Rear Heater 68-9 C Body - Hiltop Auto Parts
NOS MoPar 1967-1969 Plymouth Cuda Dodge Dart AC HEATER WATER CTRL VALVE 2837216 | eBay