Differs over the years by style and by painter. I like the traditional logos, like this, but don't have the actual measurements for it. OEM for your boat/year would be a little bit smaller. Maybe someone else can chime in?

For reference
here is my old cafe with the newer size logo, unfortunately I don't have the measurement.

I will measure this for you, newer logo (stretched) on an old school Gun. You can see it both in and out of water. My boat sits a little lower due to a lot of hardware hanging off the back, boxes, SSM5 drives, and big dopey blower engines in the bilge.