Accuracy of ERA5 in early decades (1950s) & stormy situations

Hello,
I was wondering how reliable were ERA5 datasets (10-m height wind & pressure fields in particular) in the 1950s ?
Which kind of uncertainties should be expected and which impact could they have on the reanalysis datasets ?
My goal is to simulate storm surge in 1950s periods using ERA5 (wind velocity and pressure) as input atmospheric data in a shallow water model.
Thank you very much in advance and wishing you a very happy 2025.
Best regards,
JBS.