Older Grado Gear

Hello All.  For the estate of a friend who recently passed away, I'm selling his audio gear for his wife.  I have two items I don't know how to value and whether there would be demand for:

1) Gradow G-2+ "super stereo pickup, twin tip stylus" (in Grado box, may be used)

2) Signature model TLZ stereo pickup (retail at time of sale was $500, comes in metal cylinder with all the mounting hardware, may be unused)

If anyone can tell me how to value these and the best place to sell them, that would be most helpful. 

Thanks, Peter