Thanks for the above Ian. Once again, fantastically useful information. 
 
	Interesting you say that not many were collecting Bramah variations at that time. Do you think that Bramah has had something of a renaissance since then? I must admit, I don't see him referred to very often - only by the more experienced sellers. It's a pity his book has only one edition and is so rare. Many, probably most, must have been lost or destroyed since the original publication in 1929, over 90 years ago, and we are left with mainly high priced ex library copies. Maybe there should be a re-print of his book. Copyright expires 70 years after the author's death, and as Bramah died in 1942, that 70 years was reached in 2012. I wonder if Rotographic would entertain this idea. Or maybe those who own a copy of the original book would prefer to keep things the way they are.
 
	But of course, whatever the reason, you are spot on, as it's clear that very few DFF's of even 1844 are available nowadays. Between 2007 and 2012, it would not have been too difficult to get one. So the figures are conclusive, then and now.