Is there anything written on the other side of the postcard?
According to Wikipedia, for what that's worth, actress Edna May was a very popular model for postcards. And given it's a posed photo, it's very possible that a Yost badge was added to the machine either for advertisement or as an early example of product placement.
I've seen quite a few typewriter postcards, but they're not something I collect. Here's an example of one featuring a Facit.
