Hi,
There were two genuine Olympus straps that I like.

One was a plain Black canvas strap with the name "OLYMPUS" in blue lettering.

The other (my favorite) was a wide canvas strap that was tan at the outer edges with a blue stripe down the middle and the name "OLYMPUS" in white letters inside the blue stripe. The ends of the strap are in brown leather with metal clasps and black nylon loops to attach to the camera. You can find the tan and blue version on the big auction site from time to time, but make sure that the nylon loops are included.