Staehle First Day Cover Metal Stamper Block

Hi - I have a question. My grandfather used to be a collector. He favored First Day Covers by Staehle - particularly the ones focused around Ireland. I have come across a few actual stamping blocks. Wooden blocks with metal plates that contain some of the Staehle Ireland First Day Cover designs. Does anyone have any idea of their value - if any? Unbelievably in all of Google searches I have tried I cannot find a single picture of a block stamper such as these nor on ebay. Any answers or even guesses would be appreciated. Thank you!

In your search use words stamp collectors would use like:

press, plate, die, printing, postage, etc.

http://www.ebay.com/itm/Antique-US-...AOSwA3dYDBBa

This link is similar, and it is an expensive item.

Thank you! It's a good start.