Soon after issuance of the new quarters, the Mint received complaints that they would not stack properly. Barber made adjustments in his design to remedy this problem. Accordingly, there are two versions of the 1892 quarter, dubbed "Type I" and "Type II", both for the version without mint mark struck at Philadelphia and for those struck at the New Orleans Mint (1892-O) and the San Francisco Mint (1892-S). They may be distinguished by their reverses: Type I quarters have about half of the letter "E" in "UNITED" covered by the eagle's wing; with Type II quarters, the letter is almost entirely obscured. Type I quarters are rarer for each mint.