That's a very old DL-1 with a double top bar, maybe 1930's. May have originally been made for the Asian, Arab market where they think more top bars equals more masculine virility. As an experiment try using black Kiwi shoe polish all over the frame as a wax, and buff it up good. Be prepared to be amazed! You can still get original brake pads from people in England, as I have. Or try eBay. Don't do too much to the bike since it looks pretty original.