I've seen three come up on ebay over the past several years.
one was a side tearing pad (3-hole) with 18 sheets (pale orange/tan). It didn't look like any sheets were removed, but it's hard to tell
another was a side tearing pad (3 hole) with 27 sheets (pale orange/tan).
The last was a top tearing pad (3 hole) with 18 sheets (grey). listing was that it was unused.
Maybe several print runs with different page counts?
btw, the 27 sheet pad was sold in March 2010 for $135, so if the market hasn't gone down much further, I'd say you have a valuable item in your midst
