Non-Us Embossed Stationary And Cut Corners

Hi everyone. It's been quite a while since I've posted and hope someone will be able to help.

Self isolation has finally gotten the best of me and I'm back to my decade old remount project of my grandfathers' C 1880 - 1920 cut corners and embossed stationary. Most of the US is clear; what I need is some resource materials on same, in which to search history, dates, values of items that are mostly Central America, Cuba, and Philippines. I feel like I'm looking for a needle in a haystack. Scott has zip beyond US occupied or US. Suggestions would be greatly appreciated.

Higgins & Gage World Postal Stationery Catalog should cover those years fairly well.

Of course finding/borrowing a copy is another matter.

Here's a post on that catalogue from June of this year.

Higgins & Gage Postal Stationary Of The World

http://goscf.com/t/73174