Quote:
range of numbers was probably assigned to each collector
Ron (and anyone else that's interested),
I have found contemporaneous proof that the numbers weren't assigned to each internal revenue district in ranges.*

Based on this, it looks like there were potentially up to 64 registration number 1's in the country in 1919, 64 number 2's, and so on.
Also, based on the previous clip that I posted, registration numbers were reused after a time.
So, the numbers were not uniquely assigned to just one company permanently, really.
I believe that the most logical conclusion then is that certain companies, in an effort to become or remain exclusive or uniquely identifiable, requested and then received registration numbers that no one else could ever possibly receive in the normal course of assignment.
Remember that the narcotic stamps, with their cancellations, were regularly seen by the consumer.
These firms with high numbers, such as The Upjohn Company (11,576), the Eli Lilly Company (113,363), and Parke, Davis and Company (149,834), must have thought that it was worthwhile to obtain a number that was exclusive to themselves.
Surely there was some competition, even back in 1919 with drug manufacturers.

I can understand now that perhaps the Eli Lilly Company was assigned registration number 4 at first. But then they saw the same number on a competitors' product, and when they opened another factory in Indianapolis, Indiana, they requested a number that no one else would ever use, 113,363. Of course they continued to use their number 4. As a very large user of the narcotic stamps, surely they had some "pull" at the local internal revenue office.

Since the applications were filed alphabetically, the numbers themselves weren't critical, as long as they weren't used twice in the same district.
Since the registration numbers were not unique, it explains these two stamps, which have puzzled me for some time.

The one on the left is cancelled with "#1" and with "PWR Co," The Powers – Weightman – Rosengarten Company, which was based in Philadelphia, Pennsylvania. The one on the right also has "#1" and has the "narcotic" handstamp that was used in Pennsylvania.

But Merck and Company also used registration number 1. However they were located in New Jersey.
Jim
*Source:
Federal Rules and Regulations, John A. Lapp, B. F. Bowen and Company, Indianapolis, Indiana, 1918, Article 3, page 434.