Revenue Stamps - How Collectable Are They?

Hi
I am not a stamp collector, so please forgive me if I use the wrong terminology. I have a complete set of "Rhodesian" Approved Prints of Decimal Value Revenue Stamps. They are complete uncut and unperforated panes consisting of two blocks of a hundred stamps each. They are in denominations of 1cent, 2½c, 5c, 10c, 20c, 25c, 50c, $1, $2, $4, $10 and $20. I know that the then "Rhodesia" converted to the dollar in early 1970, so these appear to have been made in anticipation of that. The cover shows details of the number of panes ordered. I would appreciate any feedback as to how collectable a set like this is? Please have a look at these pictures on Flickr via the following link:
http://www.flickr.com/photos/104215413@N04/
(sorry-I tried to reduce the file sizes but can't get a detailed image of a 200 stamp pane)
Thank you.
CVM

*** Moved by Staff to a more appropriate forum. ***

I would imagine very collectible if they are authentic. Don't know much about decimal Rhodesian Revenue Stamps but if there is any value I'd think it's in the higher value ones.
You need to have these looked at in person by an expert, someone here will drop a name for you. Neat items.

Hi stallzer
Thank you for having a look. I very much appreciate your feedback.
Regards
CVM

Ridiculously rare. This is an amazing item.