I seem to recall the Rudge as the poor man's Raleigh. If your dad didn't want to spend the big $$ on a Raleigh, he got you an assemble it yourself Rudge. I had one and the brakes were for s**t.

I have no idea what your local market pricing is like, but if you read the threads here, there are some more than amazing finds that would be better investment of your cash. In most cases, bike owners will invest more than the fair market value of the bike if there is sentimental attachment to it, want a specific vintage look, or just have too much cash to burn.

Hobbyists and enthusiasts on this forum know that finding donor bikes where the parts are good, but the frame or wheels are shot, can be a low cost way to ugrade another frame.

It's your $$ and your bike, so do as you wish.