Japanese Stamps Digital Museum

第2次昭和切手 << 1942年(昭和17年) ~ 1946年(昭和21年) >>  みほん 1-8-3

Second Showa Stamps Issued on 1942 (Showa 17) -1946 (Showa 21) - Specimen -

2nd Showa Stamps Issued on 1942 (Showa 17) -1946 (Showa 21) - Specimen - In December 1941 (Showa 16), the Pacific War broke out. From around that time, instead of the 1st Showa stamp, stamps with a stronger military color were issued. At this time, poor stamps without glue or perforations were issued due to lack of supplies and labor due to recruitment of skilled engineers. Therefore, there are more Valuation and errors than the 1st Showa Stamp.

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The above is only true for specimen stamps.
For more information and official printed stamps, see this.
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