Let me preface this post by saying that from things I have read dated precancels were only introduced in mid-to-late 1938. That being said, this must be one of the earlier ones produced:

Although I realize dated precancels are considered less desirable to some collectors and that Sears and Montgomery Ward apparently used the majority of the common ones out there, this is of interest to me because of its early date. Does anyone have any earlier ones?