I have four DL1 Roadsters. $90 is about the top I would pay for one that needed service, chain, new tires and brake pads. That would be if I needed one, and, I sure don’t. Last pair of his and hers I gave $50 each for. Parts aren’t common, but, don’t seem to sell for a ton when they turn up.
That bike is about a 1981, based on the fillet chainguard, and the lamp bracket without the bird, and a hole for a reflector. A Brooks B72 is the correct seat for that model bike. If you give it everything it needs, parts wise, you will likely have more into it then it is worth.
I rode my early 80s DL1 on the last Lake Pepin 3 speed Tour, after I converted it to 5 speed. My son rode his DL1, a 1969, with the 8” crank arms, and 48 tooth front sprocket (1965-1969 or so, the rest are 7” with a 46 tooth) but, it did get a 20 tooth rear.
Ted
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