Praktica MTL5

Hi folks, I hope everyone is safe and healthy. I just got a Praktica MTL 5 in very good condition. I actually had this camera back in mid '80 and sold it to upgrade. I missed this one so much that I had to buy one just to feel good and reminisce. It was a great performer. I could not find the serial number on the body, any of you are familiar with this camera to tell me where I can find the serial number? thank you

At the body, inside, at the backdoor-hinge.

thank you AGX, got it. So hard to see as it is black on black

It only was built during three years, without changes as far as I know, dating would not make much sense, it that was your idea.
About 600,000 samples. The same number for the MTL5 B.