re: certificate of authenticity

You will have to send the stamp to a recognized authentication service. There is not one in Austin. The one dealer in Austin lost his store as the building was sold. He hasn't been able to find an affordable place to open a new store yet.

What area of town do you live? There is the Austin Stamp Club. They meet in Manchaca, and over by the Pennybacker bridge. I belong to the club, but too far, and too long with the traffic to drive to get to a meeting on time.

Most likely the stamp is either the flat plate 610 (perf 11), or the 612 rotary press, perforated 10. The 613 only have very few known. It was printed using sheet waste (scrap paper). After 100 years, the odds that you have one are extremely low. The cost of certification is much more expensive than the stamp is worth, unless you can measure it better and really think you have one.

 
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