Nice!
The serial number puts it at June-September of 1948.
The clips! The clips!
I've been doing
a good bit of of originality research, and I haven't seen these clips up to this point - but I also hadn't been looking. They're present on the 1998 Luxury Liners, where they hold the wire that triggers the brake light. I just got the hardware and am still trying to figure out how that all works. Hopefully someone here can help answer that question.
Note: All of the following photos are from a 1998 Luxury Liner rack. There are significant differences in the design of said rack, so it's possible that the clips as executed on your bike are also different.
I would be most interested in seeing close-up photographs of your clips. I understand that my enthusiasm may be a bit excessive. So it goes.
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