The Robinaire manifold set is an older style. My dad gave me a set like that, but I couldn't find the rebuild kit so when it started leaking it got tossed. If it's in good shape and the gauges aren't busted and the hoses look good, I'd pay $25-30 for it.
The BP halogen detector would probably go for big bucks new - could be worth $100 easily if in good used shape. Might want to run the model number by BP first though and see if the sensor kit is still available for it. They do lose sensitivity over time.
Vacuum pump can't tell what make or model it is.
JMHO.