Don't know much about real vintage Parkers, but came across this which raises the quation how big is a big red, this doesn't seem particularly big to me (but then I don't know) I always thought they were bigger.
http://cgi.ebay.co.uk/Parker-Duofold-Big-R...1QQcmdZViewItem
This looks like a nice pen, but has it been misdescribed?
Andy