Offered is an IKEA Rationell wood drawer organizer/divider.  This is the discontinued version made of light natural wood.  The current version is made of bamboo.  

I found a picture online with the original product number on the box: 901.772.40

This one is only marked 18157.

In a separate listing I am selling a larger Rationell organizer from the same series.

Please ask questions as no returns are accepted.