What year is this Merc 50!!!!!!!

[Billybefishin]

I have a Merc 50 that needs a water pump however I can't figure out the year! Serial #A102181. I believe it's a 85 45/50 but I'm not 100% sure it's driving me insane please help!!!

 

[Mohawkmtrs]

I get: 1986 45HP 4 cylinder (Ser.# range - 5531630 to 0B110788).