don't know the rules where you all are. but 'round here a "professional engineer" is required to have a stamp and seal.
We did away with all that flummery in the UK on 31 July 1990, since when any documents formerly "delivered under seal" don't actually require a seal. The commonest usage of seals was on "deeds". If it's a "deed" it must clearly say so and be witnessed. (For a "deed" you have 12 years to sue someone over it, versus 6 years for a mere "contract" and there doesn't have to be "valuable consideration" which there does to make a contract binding.)
There has never, to the best of my knowledge, a requirement in the UK for a Chartered Engineer to do anything more than clearly inscribe something as being done in the capacity of a Chartered Engineer, no seals, stamps, or even a special handshake.
The requirement for all Chartered Engineers to smoke a pipe and to wear "uniform appropriate to their rank" (i.e. a tweed jacket with leather elbow patches) was dropped in the 1950s although many informally continued the practice into the 1970s.
yeah. occupational licensing at first seems like a good idea, as it would reduce fraudulent or incompetent practice. but it never really works out that way.
was proud of my license when it came in the mail in 1983. then noticed that the young lady who cut my hair, the guy who sold me my car, the realtor who sold me a house, and the guy who managed the burger joint on the corner, had an almost identical piece of paper hanging on the wall.
milton friedman made some very persuasive arguments for eliminating all occupational licensing (to include doctors and lawyers). but the legislatures would never go for it since then anyone would be able to practice law (even abe lincoln).
so why have i paid the state to renew the damn thing every two years for almost 40 years? maybe because it is in my personal interest to do so.