Hi Daren,
The cover with the wire attached is the points cover for a Lucas K2F magneto (as fitted to 1950/60's 500/650 BSA twins, etc) and the larger flat plate looks like a homemade adaptor plate to fit one of these mags to the back of the timing chest on a Mark series engine (similar to the setup on the racing Plus's). Maybe the small helical gear was part of the rev counter drive on the same setup! As for the two smaller pins - they could be almost anything.
Hope this helps,
Regards,
Eddie.