NW Michigan MI Birthday Picnic RPPC c 1915 multiple generation Grandpa Norwalk

Description

NW Michigan MI Birthday Picnic RPPC c 1915 multiple generations , maybe 4.  With Grandpa Norwalk.
Condition is "Used" with light soiling on reverse, some corner wear and one edge stain.
But the photo is very clear and so detailed - it tells us much about that era.  Birthday gentleman has a boutonniere of wild flowers I suspect presented by the children from the nearby field.
Not sure was the item pictured at the far right is, but my husband's grandmother (with 10 children) told of taking the family cow with them on picnics so that the children could have milk!!
Shipped with USPS First Class in plastic sleeve and stiffened. Sales of .00 and over shipped in dedicated postcard mailer.