Are your referring to Scott Catalogue number U67 (9¢ orange on buff) versus Scott U68 (12¢ brown on buff) or Scott types U67 and U68 which would equate to Scott numbers U277 and U288? If the latter, I have scanned the section of the UPSS Catalog of the 19th Century showing the differences of these two types. Perhaps it will be of use to you.
