If its a 45 incher, it would only be worth ~10,000-12,000 in restored condition.
If its really a 74 incher, then its worth something. The 74'' bikes are RARE, and you can't practically convert a 45'' to 74''. That bike looks like it has all the right pieces and didn't get ruined by someone making a bobber. If it really is 90%+ original, that adds to the value too. The foot clutch and 3 speed tank shift is a desirable option. If its a 1937, it will have the tin cam cover, which is really cool looking. (but its on the other side of the bike and we cant see it)
I have a 1945 WL 45''. Its a cool bike, but its not practical for anything but putting down back roads. I even swapped out the stock 3 speed for a 4 speed, but 50 mph is about all it will do, and forget about maintaining speed going up any sort of hill. You need to drop 2 gears and really rev it. I think they made something like 22 crank horsepower... but that was 70 years ago so I'm sure some of those horses are dead now.
Those are some of the sexiest looking motorcycles ever built in my opinion. The fender curves, raw looking motor, 'pogo' seat, etc. are all just right.