If I know the manufacturer is still in business, and still making the stamp, I do try to mention the name.

If the name is missing, it’s probably because the stamp isn’t available to the public. I’ve been stamping for quite a long time, and have quite a few stamps that are no loger being made, or that were never made available to the public. Most projects do not require the exact stamp I use in the sample to achieve a finished project.

In short, get over it—you really don’t need that exact stamp.