So I was on Cummins Quickserve portal tonight downloading the manual for my Onan generator. As I was looking closer at the nameplate data (see pic) I realized it says it is a 3000rpm / 50Hz. The 50Hz is kinda throwing me for a loop. If you look close, to the right of the "Model No" it looks like a sticker has been applied with "10.0MDKWB" on it. It kinda looks like it is peeling up a bit at the end so I don't know what that's all about either.

I used the actual Serial Number from the nameplate on the Cummins Quickserve portal to find the manuals and it says the "Ship Date" was March 31, 2000 so I feel like this is the original generator, but cannot figure out why they'd put a 50Hz generator in a boat designed for the US with all other pumps/motors/systems/etc. onboard the boat rated at 60Hz.

In addition, the nameplate data indicates the kilowatt rating as 8.0, but the leading numbers of the model number seems to indicate it is a 10.0kW generator, which is what was advertised when we were initially looking at this boat.

Has anyone seen/heard of anything like this? Every time a turn around I run into another mystery! Thanks in advance!!