Nice cards, well worth having. Here's a Gautag Tinnie June 1936 Limburg - interestingly the top left has a profile motif of a WW1 German and British soldier together, There were visits in the 1930's of groups of British Legion WW1 veterans to Germany, marked by accompanying tinnies, think this Gautag Tinnie maybe such an occasion. The key maybe the three letters in the triangle below.