Additional Stamp Impressions	Burelages	Design Prints	Embossings	Frankings	Margin Prints	Matrix Codes	Overprints	Postal Stationery Design Prints
Postal Stationery Form Prints	Postal Stationery Overprints	Print Substrates	Second Overprints	Silk Threads	Stamped Envelope Overprints	Stamp Impressions	Third Overprints	Watermarks

Knowledge / Differences / Watermarks

Watermark Difference: common term for two postage stamps with no watermark agreement

Watermark Design Difference: common term for two the same postage stamps with no watermark design agreement

Watermark Alignment Difference: common term for two the same postage stamps with no watermark alignment agreement

Watermark Quantity Difference: common term for two the same postage stamps with no watermark quantity agreement (e. g. without or with watermark)

Watermark Space Difference: common term for two the same postage stamps with no watermark space agreement