Envelope size standard
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Domestic letter seal standard
Code length wide note
B6 176 125 is consistent with the current No. 3 envelope
DL No. 220 110 is consistent with the current No. 5 envelope
ZL 230 120 is consistent with the current No. 6 envelope
C5 229 162 is consistent with the current No. 7 envelope
C4 324 229 is consistent with the current No. 9 envelope
International letter standard
Code length wide note
C6 162 114 New international specifications added
B6 176 125 is consistent with the current No. 3 envelope
DL No. 220 110 is consistent with the current No. 5 envelope
ZL 230 120 is consistent with the current No. 6 envelope
C5 229 162 is consistent with the current No. 7 envelope
C4 324 229 is consistent with the current No. 9 envelope