Acetone works on most glue, i used that on repainted WWII and WWI crosses and it only took off the new paint, not the old one. Rubbed very hard and none of the old paint came off. Maybe you can try it on a Q-tip and rub a small part of the reverse, change the q-tip often and look for black color on it.
Here's an after/before pic of a "Acetoned" 1914 Prinzen.
Here's an after/before pic of a "Acetoned" 1914 Prinzen.
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