Alright, got some of them weighed and about what I figured, except for the D-400 bricks of the 60's compared to the 1970 bricks, the 60's bricks are about 2 lbs. heavier. All weights are with fuel tanks empty unless stated otherwise. There are still 2 more that I haven't weighed yet, the 1973 model 5022, and the 1966 model 5234 (Deluxe). So far the 5024 is the winner hands down, even with an upgraded crankcase with dual bronze bushings. Okay now that my back is out picking up these mowers, here is a link to the winner in action if anyone cares to view. It really is a joy to cut with, and perfect for those postage stamp size lawns. I think back in those days it was more of a selling feature because kids very young like myself were cutting most of the lawns. Nowadays you just don't see neighborhoods kids cutting the lawns...at least that's my perception down here in west Texas. The professional landscaping crews do most of the lawns down here.
https://www.youtube.com/watch?v=Zc0zBgh11kY
1993 model 10420 (21 in. Alum. deck)= 67 lbs.(with approx. 1/2 tank of fuel mix)
1996 model 10401 (19 in. Alum. deck)= 54 lbs.
1973 model 7022 (21 in. Mag. deck)= 49 lbs. (with approx. 1/2 tank of fuel mix)
1977 model 5024 (19 in. Mag. deck)= 45 lbs.
1964 model 5232 (19 in. Mag. deck)= 47 lbs.
1973 model 7260B (21 in. Alum. deck)= 52 lbs.