This is a genuine Dewalt blade, (IT IS NOT A COPY) but it is not marked with a Logo or part number.
The DeWalt Multi-Tool Semi Circle Blade has 22 TPI for cutting wood with nails and other soft materials.

The blade is quick and easy to change and is suitable for all common oscillating tools.

Suitable for the following materials:
Wood with nails.
Wood.
Drywall.
PVC.

Specifications:
Blade length: 100mm.
22TPI.