It's been a long time since I posted here but I recently came across a group of these 1920's era strip cards. I have no clue what they are and wanted to know what series they're from and how many cards constitute a set? The cards appear to depict equipment used during World War I. I scanned several of them below. They appear to have blank backs. Any help would be much appreciated.

Eric G.

These are W545, which Burdick titled "World War 1 Leaders, Scenes, Insignia." The leaders are the low numbers, scenes like these, are in the middle, and insignia are the higher numbers.

I have three or four of them,kinda neat