1350-1450 sounds plausible.
This of course would be the common dating for egdged weapons with characteristic flat and down-curved
I am curious though to see a sample of such an early date with late-style quillons like yours - please do keep in mind to always watch out for the latest possible stylistic feature
on any item when dating it!
One of the most common mistakes is to date an item on the grounds of its earliest features ...