My guess is that finding parts for your Harwood will be...difficult! You've probably given some thought to finding a parts movement, and that might be as good an idea as any.
Although I do have a watch like this, I found it years ago and put it away, so I have no 'hands on' comments. Then again--having worked on quite a few other ww's of this and other eras--it seems that it would be very much like any other watch, cleaning & adjustment-wise. Just make sure the pivots and jewels are OK, that there's good escape wheel recoil, and that the balance will spin easily and for some time dial up / down / vertically, without the pallet fork installed. Assuming that all the bits & pieces are in good shape, you should end-up with a nice running watch.
Michael.