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.

Giant race car kumiki puzzle from OSK Kumiki. A twenty-five cent coin shown for scale.

Niko Raido building (or Nikoraido), a giant kumiki puzzle from OSK. There's a quarter coin in the foreground to give you an idea of the scale.

Five polyomino pieces fit into the tray. Coffin describes this design as more difficult than his others tray puzzles. Bottom of tray inscribed with "Christmas 2000", signed and dated by John Devost.

Gordian's Knot from Thinkfun - 6 board burr.Devil's Dice from World Wide Games (3 problems, with instructions).Tangrams, a plastic simulation of the ivory Chinese set.City Puzzle from Binary Arts (precursor to ThinkFun)Escape from Alcatraz, from MRM ProductsTotal weight 2 lbs 3 oz

This is George Miller's 3-D printed version of the Moby Maze, not the later version sold by Hanayama.George Miller's description: Moby Maze is probably the first maze built on a Moebius Strip. The Moebius strip is a circular band that has a one-half twist in it. This curiosity is a popular mathematical curiosity since the shape has only one side! This property is fully exploited in Oskar's design. You have to push the ring around twice to get it to the "other side". The solution is not too diffi...

Devil Puzzle by Nob and Koji, made by B&P (07-7334), light surface wear to pieces, with instructions.Bettle Sliding Puzzle, still in plastic wrap, B&P 07-6434. Designer Unknown

Robert Sandfield's "The Hangman's Puzzle". An unusual puzzle from IPP25. 

Three puzzles from Bits and Pieces: Coin Remove 07-7163: Most of you will recognize this classic design, but this has an added coin hidden in it. Doesn't add to the complexity.Double Cross 07-7082, with instructions.Three Horseshoe puzzle, metal. A nice, compact version with brass instead of steel.They all come with original packing and instructions.

Missing Notch, a Stuart Coffin design made by Fuller under his "Raleigh Puzzles" banner. I never solved it - it's tough! Obviously shipped disassembled.