Another possibility for my bike!
The Zoll Politzei handeled the border crossings and the BGS handeled border defenses.............. The bicycle colors would have been the same........The Landspolizei are the Federal State Police and also would possibly have shared the same green color as well.
It seems that the germans really have it figured out in the bicycle department! Wouldn't it be great to see more bicycles used by our own public service agencies!? Bicycles in public service....... they could save money and save lives (you can only gain so much weight and flab when your pedalling instead of driving)!