K.HZ-23 无面值“内用机邮”加盖“改作平邮”邮票

紫字/“内用机邮”(红字棕图)

Stamps without Denominations “Internal Use fpr Confidential Mail” Overprinted with “Changed to Ordinary Mail”
1945年,苏中交通总站,木戳手盖,无齿孔。苏中报印刷厂。

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