Three pieces interact in a lightbox-type frame.  Level 27.2 if you stick to the legal sliding moves but there is a cheat around move 7 involving a rotation!

An exchange puzzle at IPP34, London, no longer in production, this is a difficult sequential discovery puzzle.  A full description is on Brian Young's site at http://www.mrpuzzle.com.au/big-ben-puzzle.html

#30 in the Stickman Puzzlebox series. which you can read all about at http://www.stickmanpuzzlebox.com/stickman-puzzle-gallery.htmlThis is number 36 of 50 completed boxes and includes Robert's 9-page directive booklet.

This is a very nice box by Fumio Tsuburai.  It is a coin bank and has yosegi on the top.

Ronald and I were chatting back and forth by email a few years ago and came up with the name of this puzzle together. I always liked the design, and always meant to produce it, but somehow never got around to it until now.This interesting iteration of a six piece board burr uses a symmetrical center piece to limit and focus the interaction of the six dissimilar pieces. It is a fairly difficult puzzle to assemble; disassembly can be tricky as well with nine moves to remove the first piece. I real...

Wonderful trisection of a cube

Nice toy

a new released cross and crown puzzle

Another great Dan Fast design.  See Eric's comments at http://archive.cubicdissection.com/html/shakesomething.html

A beautiful 9-piece burr.  See Eric's comments at http://archive.cubicdissection.com/html/triplev.html

A wonderful tricky interlocking puzzle based on triangular prism. Has 19 steps to dissamble the puzzle. The puzzle is for beginners but also for experienced puzzlers.You have to pay paypal fees.

you have to build a cube with the pieces

A great 9-piece burr.  See Eric's comments at http://archive.cubicdissection.com/html/triplet.html

Wil Strijbos - Aluminium & Sweta CrossExcellent Condition

Wil Strijbos - Bolt PuzzlesExcellent ConditionIncludesLow Number BoltNipple  Bolt

Will Strijbos - DovetailsExcellent ConditionIncludesConvexConcaveT

More tricky than it looks!  See Eric's comments at http://archive.cubicdissection.com/html/rupture.html

Wil Strijbos - Bottle PuzzlesExcellent ConditionIncludes:Cola Bottle #2Cola Bottle #4IPP32 Exchange Bottle

This is what I think was a Bakelite version of Loony Loop. A little research turned up a picture that looks like this one from a Chinese puzzle kit, on page 96 of Denk Spiele Der Welt, by Delft and Botermans. Unfortunately, it looks like the plastic has started to deteriorate on the end and in a spot on the middle. Most likely pre-1900, based on the other puzzles I procured from the same auction. 

IdentTrick by Vesa Timonen, Tomas Linden's exchange puzzle for IPP34. Arrange the three pieces so that the white areas and the black areas make identical shapes at the same time. Very tricky, even after I figured out what was required to solve it.