Help Identifying A Vietnam Military Stamp

Hi all,

Trying to figure out what I have here. The top left stamp is Scott M20, and the top right is Scott M22. I'm not finding anything for the bottom red stamp. The only varieties I find are related to perforations.

I noticed in the catalog there is no Scott M21.

I can't help with Scott, but the lower stamp is Gibbons NMF 758, issued on 19/5/1975.

In cases like this, it's sometimes helpful to know what edition of Scott you're using.

Good point Classic, and thank you.

The information I found and presented is identical in both the 2005 and 2018 Scott Catalogs.

And appreciate the info from Gibbons GeoffHa, I'm pretty much limited to Scott without tearing through the interweb. I can use the info you provided to at least cross reference.

Does Scott "delist" stamp issues? Since there is no M21 in the catalogs I have access to I wonder if this use to have the M21 label.

Lance

It does, but reasons aren't always explained by the editors or clear to the readership. In this case, understanding why might require hunting down whatever edition was the first to not have that issue listed, and hoping there's a note about it.