Tromsa Kombination M4

This week I made a new addition to my drum collection. I got my hands on an old Tromsa drum from the end of 1960's or beginning 1970's. It looks like a model "Kombination M4".  Anyone has more information on the origin of this set, please post me a comment.

Here's some pictures.

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Sources:

• http://home.arcor.de/pfaue/tromsa/katalog/kataloge.htm
• http://www.vintagedrumforum.com/showthread.php?t=8591
• http://www.youtube.com/watch?v=j8uC8D1afkA