USA - Hundreds (!) blocks of four mint stamps including plate numbers in unique positions in two White Ace - Michel

Unique compilation of hundreds of four-blocks in two historic White Ace albums:

Part I: the most diverse four-blocks including English-language commentary per issue
Part II: the most identical four-blocks, but each with the plate number in a unique position in the margin

All behind a transparent Hawid on special sheets for plate numbers.
In two original White Ace albums, made in Washington, D.C.
All stamps still postage-valid!

View the photos for your own impression. Everything is depicted.
Free shipping to countries where most buyers come from.