I would agree with Peebee that leather street would be your best bet but I can't say that I have ever seen one there. I couldn't even get the type of wallet I wanted there, i.e. long, inside jacket pocket style with a lot of credit card slots rather than the folding back-pocket style, and they have hundreds of wallets.
Amazon have them but the majority are PU leather not real leather. The ones that are real leather, like this one
, tend to have a slot to slide the cardboard back of an A4 tear-off notepad into rather than a clip to hold loose papers, like this PU leather one
. Both types have a slot on the left to hold loose papers and various other pockets that never seem to fit what you want to put into them.