Hi Mike:
I believe the correct medal for the Spange would be either the Allgemeines Ehrenzeichen 2. Klasse 1847-1918, or Allgemeines Ehrenzeichen in Bronze, 1912. The Mannschaften Dienstauszeichnung 2. Klaße (twelve years) rules out the RAO, which was exclusively an officer award.
The good news is you've got a great Spange, a bonus Rother Adler-Orden 4. Klaße, and you can readily acquire the correct medal(s) from Herr Weitze (search for items 26116 and 59042).
Now, I need to scrounge up more things to post.
Chas.