Haley's Comet commemorative medallion. 
This coin was produced in Japan in commemoration of the visit of Haley's comet in 1986.  It is blank on the back face, but for $1 I'm not complaining!  At the time it was made titanium was quite an exotic and expensive material and I imagine the token was quite a bit more expensive back then. 
The eBay seller described it as a Chinese medallion, but in fact the inscription reads "Haley's comet commemoration" with the name Haley rendered in Japanese katakana (phonetic) lettering which is not used in China. 
Source: eBay seller sevyg 
Contributor: Theodore Gray 
Acquired: 27 October, 2003 
Price: $1.04 
Size: 2.5" 
Purity: 99% 
Sample Group: Coins
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