THIS NOTE IS THE OLDER LARGE SIZED £10 issued in 1988 - Royal Bank of Scotland aUNC, serial number A/31 703742. I have described the note as 'about uncirculated', as I cannot guarantee that it is UNC although the note does appears to be.
This is the larger 'A/1 series prefix' and was issued for a short time before the smaller note of similar design was issued in 1992.