Looks like an early Aerokits Sea Hornet.
http://lesromodels.co.uk/product/aerokits-sea-hornet/.
The construction suggests a model from the 1960/70s, are you sure it's fibreglass, the hull shows wood?
Would look stunning when restored with say a 35xx or 42xx brushless coupled with a 35/40mm prop 100amp ESC and 11.1/14.8 LiPo. Make sure you find a few model figures to add realism.
A build blog would be welcome, please.
Good luck