The grade of Baltic birch plywood that we use is called “BB/BB” which means it may have up to 6 color matched patches on one side in a 5×5 area.
Currently it’s the only kind we stock, so regretfully we can’t guarantee it to be any different from what it is. We will always do our best to put patches on the inside of our products so they are not as visible. This is not always possible.
Patch-free Baltic Birch is a much more expensive product, and more difficult to come by.
The grade we offer is a balance between cost and appearance.
source: https://www.woodworkerssource.com