[Boatanchors] Nassau solder now valuable?

[JOE]

I was talking to a friend of mine who, years ago, worked with me at the 
local telephone company.  He told me that he was snooping around an auction 
sites for old Western Electric junk and found that "Nassau Pedigreed 
Products" solder was selling for up to $580 for a 5 pound spool?  I 
probably had 5 rolls of this years ago and only have 1/2 a spool 
left.  Anyone know what makes this rosin core solder worth so much?  My 
curiosity is getting the best of me.

73, Joe, K1ike