Thankyou BerberDagger and Koto for your opinions ....appreciated

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Could you tell me how you know the approx. age of this sword ? is it the general design ? materials or overall condition ?
I wasn't thinking of a major restoration, just a mild improvement. I will probably (carefully) re-peen the tang to take up the looseness, and gently straighten the guard. I may etch the blade to see if there is anything 'interesting'.
Kind Regards David