Seeking Information On Ukraine Underground Postage Sheets From Grandfather's Collection

Hello everyone,

I recently came across some Ukraine underground postage sheets in my grandfather's collection and, despite searching online, I haven't found much information about them. I was hoping some of you might be able to share your expertise or point me in the right direction.

These sheets are quite fascinating, and I'm eager to learn more about their history, significance, and any details that could help with identification and potential value. Has anyone encountered similar items, or can you offer any resources for further research?

I'd greatly appreciate any information or insights you might have!

Thank you in advance,

https://poststampua.com/en/stamps-o...t-of-ukraine

thank you sir , very helpfull link

I had no idea of the underground postage. Thank you for sharing.

i was the same till I come across those sheets , philately every day new information