Note without a Serial Number?

N#203035

Is this the only one or are there other precedences?

N#214996

N#208607

N#207432

Adding serial would cost more than note value.

The first issue of Ukrainian coupons (P-81…87)

Russian treasury small change notes (P-24…31)

Russian Siberian 50 kopecks (P-S828)

Hong Kong (P-321…323, 325…327)

Austria (P-73, P-74)

British Armed Forces 5 new pence (P-M47)

Some of the Japanese banana money

Hungary (P-M1…M4)