Well, the first Milgauss probably was the 6543, issued in 1954.
The difference? The straight second hand, while the 6541 had a lightning second hand.
Here is a 6543. Credit picture: Squarespace.
A superb 6541 I saw in Paris:
Patrice's 1019 in Italy:
A black 1019 seen in Paris:
1019 Black Swan. Credit picture: Phillips:
Our friend Tyler's 1019:
And mine, the 116400GV.
As you can guess, I am a huge fan of the Milgauss!