I ran across these untrimmed covers 4 years ago at a gunshow in Rochester Minnesota. I have four different ones, all the guy had left. He claimed he got them as the remainders of John Ambers estate, probably so. I don't think there is any errors in printing, though I have not looked real close either.
Still they are interesting and a nice addition to the Gun Digest collection.

Click image for larger version. 

Name:	IMG_2718.jpg 
Views:	23 
Size:	72.5 KB 
ID:	220132