Nice! Unlined Galway on the 64? Send me a link. Curious to see the makeup. Yeah I take the same size in all EG and they fit well (+/- .25 size) so uk10.5 sound right for you
I sized down 1/2 in the oscar from Robert last. I was able to do the same with rain last so figure open laced oscar will fit well.
Carmina (shell boots):