How do we value the gift of a hand painted shoe to a athletic shoe manufacturer to demonstrate our design abilities?

We are a start up, that advertises hand painted wearables.  We purchase clothes, paint the designs and advertise for retail on the internet.   Our athletic shoe designs are listed at $1,200 on the internet.   Recently, created a unique design, applied it to a manufacturer's shoe and gave to the manufacturer to demonstrate our designs.

How should we value this?  Is it marketing? Is it  gift?