Need help with identification with lower unit

[Powellfisher]

I have a 1998 Mercury 225 EFI Pro Max and the lower unit has the identification of R99I1345 RH R1.87:1 stamped on the mating surface. No other identification and I can't find any information on the net. You help is appreciated.

 

[gmorgan]

I have personally only seen those metal stamps on Sportsmaster gearcases, and I believe it may be a ‘99 model, maybe a serial number, right hand rotation and 1.87 to 1 gear ratio.

 

[Powellfisher]

Thanks for the info. I looked on Ebay and someone has a Sportmaster for sale that looks like what I have except this one has a stamped metal water pump housing and mine is cast composite. They are asking $4200.00.