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I have been a lifetime Led Zeppelin researcher (not just fan). Have gained a strong reputation as an appraiser of their rare records and memorabilia. For various reasons, I cannot respond to emails sent to my personal account, but I will always respond to questions posted here!

Experience in the area

Countless hours of biographical research and personal interaction with relevant individuals. Avid contributor to Led Zeppelin newsgroups since 1997 (check Google groups!)


Bullseye News Magazine. The Vapid Voice.


Masters Degree, Computer Science. Bachelor's Degree, Psychology.

Awards and Honors

Several literary awards.

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
Sheila01/20/17101010Thanks Mike. Great help.
Sheila01/11/1710101010 for all.
andy02/11/16101010Thanks Mike, aside from the hazy memories .....
Robert01/07/16101010Hi Mike Thanks for your info, exactly .....

Recent Answers from Mike Caldwell

2016-06-17 Led Zeppelin I have the "Side two" label on both sides of the record:

Hi Andris    Though I am not surprised, I hadn't yet been aware of a 588171 with a duplicate "Side Two" label.  This copy would be more accurately called a mislabeled record, rather than a misprinted one

2016-02-09 Possible Led Zeppelin Bootlegs:

Hi Andy    Your eyes did not deceive - though relatively rare, there were copies of Mushroom's "Live On Blueberry Hill" pressed to solid red/yellow vinyl.  Quite hard to find, since a vast majority were

2016-01-06 Listen to this, Eddie lp:

Hi Jeff    There are several different pressings of RSR's "Listen To This Eddie". The most desirable of these is on red vinyl, which can fetch $250.  Other versions (including the the Box Top reissue)

2016-01-06 bootlegs:

Hi Robert    Back in the 70s, it was relatively commonplace for someone to take an existing bootleg and make it their own with a different title, label, and cover.  Since most of this activity was contemporaneous

2015-08-21 winterland poster 1969:

A guideline, if any, has to do with the Winterland posters.  Originals and valuable early reprints measured less than 14" in width.  Less valuable, newer reprints were always 14" wide or more, with the


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