10th Anniversary of the Incident on 7th July (七七抗戰十週年)

Yang NE64-67, Yang NE68M, J.DB-44, J.DB-45

Perforated:

10 元 ⦿ [Yang NE64]

30 元 ⦿ [Yang NE65]

50 元 ⦿ [Yang NE66]

100 元 ⦿ [Yang NE67]

Imperforated stamps (on silk thread paper with watermark):

10 元 [Yang NE64a]

30 元 [Yang NE65a]

50 元 [Yang NE66a]

100 元 [Yang NE67a]

Souvenir sheet (silk thread paper with watermark):

Composition of four stamps (whole set) [Yang NE68M]

Composition of four stamps (whole set) [Yang NE68M]. Variety with dot before "局".

Watermarks varieties like inverted or sideways can be found (like the illustration in the post about the souvenir sheet Yang NE59M).

Souvenir sheet (print varieties on silk thread paper with watermark):

10 元 double print [Yang NE68Mb].

One value missing [Yang NE68Mf].

Two values inverted. This souvenir sheet has oversize [Yang NE68M].

Unseparated large sheet of souvenir sheets (of four, 2 x 2, half original large sheet)*:

Unseparated large sheet of souvenir sheets (of four, 2 x 2, half original large sheet) with variety 50 元 rotated / shifted.

* Because of the large dimension of the unseparated sheet the scan was done in two turns and both halves were joined together as one scan.

Souvenir sheet (print varieties on newsprint paper without watermark):

Printed on both sides. Variety with dot before "局" [Yang NE68Mh].

Rear side.

Printed on both sides. One side with variety dot before "局". This souvenir sheet has oversize [Yang NE68Mh].

Rear side.

Souvenir sheet (proof print on thick unwatermarked paper):

Proof print [Yang NE68Me]

Remarks (in general / for this issue):
– All commemorative stamp issues from Northeast are rare on commercial covers.
– Shifted perforation and large stamps with “wings” can be found commonly.
– Because of the existence of large stamps (inaccurate line perforation) single “imperforated” stamps can’t be count as imperforated stamps.
– From time to time you can see various black proof sheets on thicker newsprint paper often in reverse or inverted printing and / or in combination with different values / sets (like the one shown in Yang catalog page 118, Yang NE68Mi). Sometimes also printed on thick watermark paper. A valuation is hard to calculate, often the authenticity is just doubtful, if sold the price not seldom exceed 10.000.- USD, but please handle these proof prints very carefully!