You are lucky!
There is one on ebay right now.
http://cgi.benl.ebay.be/OLD-SCHOOL-BMX-MRD-EXPERT-FRAME-AND-FORKS_W0QQitemZ7230032287QQcategoryZ57267QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I have one sitting in the garage. It is the Expert model and has many original parts however it needs a spruce up. I am trying to decide whether to rebuild and work on it or sell as it is. The frame is missing March Racing downtube decals and needs some wirewool work to the chrome but generally very original. I believe the there were less than 250 MRD frames made so they are quite rare. There is one currently on ebay also that appears to be similar condition to my own.
John Paul
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Replying to:
Can anyone help?! I used to ride a MRD frame 84/85, and want to get another. Does anyone know of any?