Hot Rods offenhauser intake

i picked up a offenhauser intake this weekend and i was wondering if theres a way to figure out what year it is.

 

look for a date cast into bottom. I got a flathead intake with ?/85 on it

 

it has 5693 on it

 

That's the part number.

 

It's probably as old as it looks...you can buy them new. What condition is it in?

 

those are the only numbers i can find on it. its in decent condition but i have to really clean it.

 

Pictures, Please ?

4TTRUK

 

it wont let me upload them here so i am trying to put them in an album.
if it helps it has the oil fill on the intake.