Origin: Unknown

Identifying Clues: Men are wearing ties that have from what I can see the letters O, N, C on them. 

Maker: AZO

Era: Between the years of 1904 and 1918. AZO mark has 4 triangles pointing up. That narrows down the date. 

Pre-owned and unposted.  See photos for assessment of visible wear normally associated with old postcards. Especially, but not limited to, tanning, creasing, edge and corner wear, and discolorations.