It appears that the v15 type IV is one to avoid NOS or used.
Here is a quote from an experienced Ebay buyer/seller of NOS cartridges that I saved for reference:
"My experience is:
Grados - no problems
Audio Technica - no problems with originals, I've had seized up 'replacement' styli
Shure - older designs seem to be fine. Several very stiff V15/4 examples, though.
Empire - all have been fine"
Here is a quote from an experienced Ebay buyer/seller of NOS cartridges that I saved for reference:
"My experience is:
Grados - no problems
Audio Technica - no problems with originals, I've had seized up 'replacement' styli
Shure - older designs seem to be fine. Several very stiff V15/4 examples, though.
Empire - all have been fine"