Royal produced five portable models in 1939, which makes the hyperbole and spelling errors (Quite Deluxe instead of Quiet De Luxe) in the eBay auction you referenced amusing. Photos of your machine would help to identify the model, but if your machine is identical to the one in that eBay auction it isn't an Arrow. Does your machine have a tabulator like the machine in that auction?

Haven't managed to take any pictures yet and not sure what a tabulator is.  To my eye they look identical but I am sure to a trained eye there might be far more differences.  All I know is that it has the round key for shift not the rectangular one and the serial number starts with a c which makes me think it is an arrow not a quiet deluxe.  

Shame the ebay ad is a con.  I got all excited that it might be something special, but I am aware how easy it is to inflate things for sale.  Is there even any such value placed on first edition typewriters, or is that just nonsense?  I have an interest in old sewing machines and I am amused by how ridiculous some peoples claims are when so many were made and still exist.

I am still interested to know more about the machine.  Other than it looks very pretty, is there anything particularly interesting to note about the Royal Arrow?  What is it made from? It has a matt finish.  At first I thought it was bakelite, but now unsure it is made from some metal instead.    

I have taken a photo but unable to upload it as I need to have an account with flickr or something similar, so I will best try and describe it.  

Yes it does have a lever that says magic margin.  All the keys are round including the shift key.  It doesn't have a tab key on the right, just fraction keys.  It has a LOCK key above the left shift/freedom key and on the top right it has a key that says MAR REL which I am assuming is something to do with the margin.  

When I look closely it isn't identical to the ebay listing, but to a complete novice it looked it.  The only writing on my machine is Royal above a single chrome bar, unlike the two bars on the ebay listing.  It doesn't have any other writing and no indication at all to where it was made.  Box looks similar to the one on ebay but have no idea what it is made from but it is pretty light.  Unable to lock box but there is a key supplied that doesn't seem to work but is folded over and looks like two keys stuck together.     

 

From what I know about early Royal portables already, and what I looked up on Google and YouTube (See Front Stroke EP 7: Royal Arrow), the c before the serial number indicates that it is a Royal Arrow.  Royal Arrows don't have a tabulator (or TAB key), or left-hand paper guide.  Also absent is the chrome piece under the cover--this is painted black on the Arrows.  The carry case is also black, but I haven't seen any other type of carry case even for the Quiet Deluxe models except for a textured gray carry case for a Royal Companion from 1941.

I am not sure how to post a photo, but from your descriptions and google images it seem to be an arrow.  A friend who knows more about typewriters came and had a look at it and thinks it is in  great nick.  It doesn't have Arrow written on it, but not sure if that makes it one of the first ones or not.  

Anyone with any useful advice on royal arrows and any nice quirks to this machine?  What type of ribbon do I need to buy?  Is it just a universal ribbon that does most machines?  It is a joy to type with but as I have little experience with typewriters it might be like any other.