Mr. Krainz, no problem using my photo. This was a standard colour from Strida 3 or 4 years ago. A Strida distributor could order any model of Strida with this colour but I think most were the Lt model. The dark blue looks black until you look closely and when the sun hits it you can see the metallic blue. It was very difficult to show this in a photo.
As BlackStridaAustria has mentioned the things to look for to see the difference in the frames is the support under the stem, the supports added to both sides of locking latch bracket, the added support for the front tube at the front wheel and the bottom bracket redesign.
Bill