Watermark "unwmk" (Palestine usage only)

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Short desc: unwmk
Description:

Used by 5 stamps of Palestine: (See all uses as list)

1923 1m bisbrn
1923 2m grn
1923 4m red
1923 8m vio
1923 13m dkbl

All are postage due d=numeral (1923 Palestine) perf=11