440 Sixpack Idle Solenoid for sale on CL.. Not Mine..

Hello All,
Wile surfing the internet I cam across this for sale ad "1970 440-6 Idle solenoid"
1970 440-6 Idle solenoid
Question to my fellow FABO is this part so rare that I would have a value of $450.00?
I know nothing on this subject and was just wondering if this is correct.
P/S I hope I posted this in the correct location.
Happy Mopar :)
Arron.