Mark 10 CDI, Can someone tell me about this and what it might be worth ? Options

[gandalf_025]

I came across a box I have had in storage for many years and
since I'm trying to clear out stuff.... Was interested in finding out
if this has any value so I can sell it to someone that might need it instead of
bringing it to a swap meet in the future.
It is a Mark 10 CDI unit with a bunch of stuff in the box with it, including
a note that says it was NEW and was a display unit that was shipped because it
was all that was available.at the time.
There is a date of 1971 on the box..
I have been told this might be OK to use in Vintage racing because it was
of the correct era.??
Can someone here help me get an idea of what it might be worth since
I have to post a price if I try to sell it.???