Welcome to Just Answer and thanks for your question. I haven't seen this question before. However, I can tell you that every Langer painting I've ever seen has been signed with his whole name "Viggo Langer" and the year it was painted. His paintings have been copied and reproduced and that may be what you have. There is really no way to say with certainty without being able to examine brush strokes, etc., but it doesn't seem likely that this is a Viggo Langer.
Thanks. I heard just this week that we will be upgrading file size to 5 MB so that should help in the future. Having Christies take a look at it would always be the best idea. There are a lot of forgeries out there and some of them are extremely well done. I've seen some beauties on ebay that would pass (at least in the close-ups on the computer screen) for Old Masters if they weren't signed by the current copier. I hope it turns out to be a Viggo Langer. His paintings are so beautiful.