This guide discusses only the DEUTSCH-NEUGUINEA 1909 clasp - which was worn on the Kolonialdenkmünze. The Imperial German Colonial Medal (Kolonialdenkmünze or KDM) was established by Kaiser Wilhelm II on 13 June 1912 with revisions on 17 February 1914.  The medal with clasps was awarded retroactively.  The DEUTSCH-NEUGUINEA 1909 clasp was awarded for 3 different events:

• April 1909:  Ndrano Punitive Expedition.  Plantations and residents had been attacked by the Ndrano and the Imperial German Colonial Government decided to punish them.  The Police Troops (under 150 men) engaged the Ndrano with casualties to both sides.  Troops serving in these actions were not present at the Wakaia area actions in April and May.  
• April and May 1909:  Actions in the Wakaia area of New Guinea.  Wakaia area plantations, farms, and residents had been attacked by bandits and the Imperial German Colonial Government decided to punish those responsible by sending out a series of patrol (totaling less than 75 men).  Little information is available on these actions.  Police Troops serving in these actions were not present in the Ndrano Punitive Expedition in April.
• September 1909:  Asmata Punitive Expedition.  Plantations and residents had been attacked by Asmata bandits and the Imperial German Colonial Government decided to punish those responsible.   The Police Troops (less than 175 men plus at least 1 German Leutnant, a German Doctor, and 4 Polizeimeisters) engaged the bandits with casualties to both sides. 

This clasp was awarded only to Imperial German Colonial Police Troops.  Currently, the number of entitlements to this clasp is unknown but it is believed to be less than 250 total.  While the medal is somewhat rare, these bronze DEUTSCH-NEUGUINEA clasps are very rare.  Medals with this clasp to verified participants serving at Wakaia are the most highly sought after but verification is required (the price will more than double!).  As of 1 January 2007, this bronze clasp is only known in one officially issued type:  same width as the ribbon, wide lettering, flat back, pebbled background and with soldered sharp flat prong backs.  This is not to say that another type wasn't officially issued as well but that only this one type has been verified. 

• In 1990, a verified medal group with this clasp (for service at Wakaia) and documents was on display at a Hamburg, Germany Dealer and was not for sell. 
• In 1999, a single clasp was sold in Germany for €144 

My best advice is:  Buy this clasp only from a reputable dealer who specializes in Imperial German medals and will offer you a 100% guarantee.  For your convenience, other associated guides can be found at:  http://reviews.ebay.com/Imperial-German-Medal-Guides-Index_W0QQugidZ10000000002386112 and/or  http://reviews.ebay.com/Imperial-German-Colonial-Medal-DEUTSCH-NEUGUINEA_W0QQugidZ10000000002379852.  Please visit my blog (http://blogs.ebay.com/tsa-li) for further information.  Thank you for your visit!