Age of this panel(square D) HELP

Im doing a 4 point inspection and citizens in florida requires for a panel to be upgrade within the last 35 years. This panel was in the house when the moved in in 84. In order for it to be considered upgraded within 35 years it has to be a panel installed after 1976. I took a photo of the tag on the inside. It looks like it has a
serial number inprinted( J09N1412) i think this is a serial(see photo)
box cat no. q0b 4cm150RB.
Series E-8
issue no B.2015

can any of this info tell me the date. Was it installed in the late 70’s.
When did they start to use main breakers in panels?

Thanks a bunch if anyone can help. Dating Panels is my weakest ability. Drives me crazy when its for a 4 point and I need to know if its 35 years or less







Pick a forum and stick to it. There’s no need for multiple posts of the same question.

sorry about that, I’m new to the forum and was not aware of who can view the members only portion so I thought I would post it outside of it incase a non-member can help. Wont do again

Take a look here:

Looks like Sept 9,1983

Posting in the appropriate technical forum (such as here in the electrical forum) will give you the most exposure. The Members Only sections have a limited number of viewers.

As Jeff said. If you post in the appropriate section, the people that are knowledgeable in those categories will respond, and you usually will get better responses. Example: non-member sparkies don’t usually hang out in the plumbing section.