Hi. I checked out the "How old is my gun?" post but couldn't find what I was looking for. I'm hoping you collectors already know how to read the serial numbers?

I have a Model 25 .22 Micro-Groove Barrel Cal 22 S.L. & L.R. with a serial number 16699360. I'm just trying to figure out how old it is. That is to say, I'd rather discover Marlin retains invoices to tell me who it was sold to, but from the Marlin website there was specific mention that they cannot tell you who a gun was shipped to? This weapon was in my Dad's things and it could have belonged to my Grandpa, Great Uncle or my Dad, and I'd like to find out as much as I can.
Thanks for any help!