Hi:
It looks a lot like the Sanson, from Artesania Latina

https://modelismonavalymaquetas.com/remolcador-sanson-tugboat/

This is the official site of Joffre:

https://www.hartleysauctions.co.uk/sales/toy-collectors-sales/ag031020/view-lot/181/

Nice looking scratch built model possibly copied from the smaller Caldercraft kit, as Martin has already indicated. Some years ago there were several suppliers who manufactured Fibreglass hulls and sold plans to allow modellers to complete their model. Sadly most have now ceased trading together with details of the hulls on offer. Are there any electrics etc inside as this may give an indication to its age and help narrow the list of possible suppliers. Plastic for superstructures was quite popular from the late 1970's and scratch building was more popular during that period. If you bought from the original owner this may also help identify its provenance.
At the end of the day you have yourself a model to be proud to own.
dave976

My Joffre is an original Caldercraft, but requires attention.
Cheers Colin.

Built this one but think it was caldercraft. It was on display at a shop in Salem MA. Unfortunately the place went out of business n the model lost. Loved making it. Great kit with hood details

She is a Joffre, But it must be a larger scale than 1:48.

Compare photo.
https://www.hartleysauctions.co.uk/sales/toy-collectors-sales/ag031020/view-lot/181/

Martin.