A post on 'That other forum' led me to go to the Estes website to check something out.

With all the federal, state and local regulations concerning product safety and other issues, Estes maintains a listing of each product with a form that shows provides information on it's compliance with these regulations.

In addition, the form lists dates of production and where they come from.

Very interesting.

Most of the products are listed in 'blue' wording. 'Click' on it and the certificate appears.

Discontinued or recently introduced products are listed with 'gray' wording. One cannot open these listings.

The C5-3 motor and Low-Boom SST are listed with gray wording.
One is available and the other will be soon.

However, there are B4-6 and B8-5 motors listed in gray print.
Neither has been made in decades.
New production?

Check it out.
Enter 'Certificates of Compliance' into the SEARCH box and wait a while.
A product number listing will appear.
Select any of the 'blue' listings to see that items certificate.

__________________
Bob
S.A.M. # 0014