这枚波兰邮票的加盖不太明白

jiuyie

这枚贝鲁特总统1950年邮票原票面值是10Zt(本币：兹罗提），加盖辅币Groszy（辅币：克罗钦）。票面除加盖辅币单位，而未改数字。那就是说改值为10Gr了。是邮局缺低值票了？斯科特邮票目录上有这样一段话，本人英语水平不高，请有识之士帮忙给看看。如下：
“GROSZY”
To provide denominations needed as
a result of the currency revaluation of
Oct. 28, 1950, each post office was
authorized to surcharge stamps of its
current stock with the word “Groszy.”
Many types and sizes of this surcharge
exist. The surcharge was applied to
most of Poland’s 1946-1950 issues. All
stamps of that period could receive the
surcharge upon request of anyone.
Counterfeits exist.

从1950年10月28日往后再发行的邮票面值下降了50-100倍，面值最小的5Gr，一般是45Gr了。是跟咱们中国1955年币制改革一样吗？