from top to bottom
1. this is and 8in late 60's towards end of production flowing thin script with pronounced full curly tail on the g. larger copyright r. thick behind the edge and not as well ground.
2. this is a 10" early 60's flowing thin script slightly smaller Hi carbon print and smaller copyright r, g tail missing( at first I thought this was just a poor strike or the g wore away but, I have seen this a lot and it is always consistent with this batch.) thin behind the edge and beautifully ground
3. this is from a mid 50's cleaver the stamp is bolder the script slightly different and about 20% smaller then other logos, better quality strike and a different full curly tail on the g. thin behind the edge and beautifully ground.
4. This one is from a 10 in early 1950's The stamp is deeply struck, much crisper and of a better quality it is about 20% smaller then the later model ones and has a distinctive tail on the g. Thin behind the edge and the best ground.
The olde ones are better struck and better ground in my opinion. I contribute the loss of quality to an aging work force and modernization. As the company got closer to its end they let the highly skilled more experienced workers go and just sorta phoned in the rest with the newbs.