The Canon 7 and Canon P are both very rugged. I had a Canon 7 picked up cheap that had been dropped so hard that the solid glass prism sheered off near the base, through the glass. Rangefinder was accurate. Cleaned the glass shards out of the mechanism, glued the prism back together- worked fine.
If you are shooting with a lot of lenses- the Canon 7 has individually selected 35|50|85+100|135, parallax corrected projected lines. The Canon P has 35/50/100 brightlines, also parallax projected- but always visible. Both have large viewfinders, the Canon 7 is 0.8x mag, the Canon P is 1x. For eyeglasses- the Canon P is easier on the eyeglass lenses.
Both were produced in large numbers, both have metal shutter curtains, both are fairly low-priced these days.
Currently have the Canon III, Canon IIIa, V-T, Canon P, and Canon 7. Had the VI-T, and L-1.
The V-T "deluxe" trigger wind is "unusual", and I got it with a perfect-glass 50/1.2 for less than what the lens sells for.