The Yin Yang Collection - Only 350 sets of this exclusive 15-piece collection 
Includes the complete series of "Inventions and Discoveries" Silver Proof coins issued by the China Mint in 1992 and 1993. As well as those 13 Silver Proof coins two special additions - a Chinese "dragon" artifact and the magnifecent Five-Ounce Silver Proof issued to honor 1994 as the "Year of the Dog" - are included to make it truly unique. 
 
Included: 
I Ching/Yin Yang - 5 Yuan
Date: 1993
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
I Ching/Yin Yang - 50 Yuan
Date: 1993
Denomination: 50 Yuan 
Composition: .900 Pure Silver
Weight: 155.5 grams
Diameter: 70mm
 
World's First Money
Date: 1992
Denomination: 3 Yuan
Composition: .900 Pure Silver
Weight: 15 grams
Diameter: 30mm
 
World's First Paper
Date: 1992
Denomination: 3 Yuan
Composition: .900 Pure Silver
Weight: 15 grams
Diameter: 30mm
 
World's First Compass
Date: 1992
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
World's First Kites
Date: 1992
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
World's First Seismograph
Date: 1992
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
Maritime Discoveries
Date: 1992
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
Bronze Age Treasures
Date: 1992
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
​​​​​​​World's First Sirrups
Date: 1993
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
World's First Umbrella
Date: 1993
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
Terra Cotta Warriors
Date: 1993
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
Mathematical Place for Zero
Date: 1993
Denomination: 5 Yuan
Composition: .900 Pure Silver
Weight: 20 grams
Diameter: 40mm
 
In addition, the Five-Ounce "Year of the Dog" Silver Proof was issued to celebrate 1994 as the Year of the Dog in the Chinese lunar zodiac, and the Dragon artifact reflects the importance of the dragon in Chinese culture and its place in the I Ching.