Please use a web hosting site (like photobucket) to store pictures so you can post them here, using attachments makes it hard to view the pictures when you have to scroll to see them. Seeing comparisons of models is hard to see with attachments too.
Ok, nice pictures though. 1965 was the year the 19c was phased out and the same year the 75b was introduced but the blue/green 75b was later in the run I think, so that doesn't help.