Russia 2019 Definitives RARE Set with a cancelling typographic overprint on stamps

Stamps with a cancelling typographic overprints come from the official state packages of 1000 sheets, which arrive at the post offices from the mint, they designate the sample (specimen) of the stamps contained inside. The cancellation overprints are specially applied in the printing house specifically for these stamps-samples on the packages before gluing

Very interesting and rare!