Lovely bikes!
Here is another track bike made in 1972, the frame set original belonged to two times Dutch national Pursuit champion (1968&1970) Leo Duyndam and was made by an Amsterdam based shop called Presto (with famous builders like Peter Serier and Jan Legrand):
And here is my (probably 1974) Gazelle Champion Mondial track bike. The first pic show my first build up, the second picture shows the current state with Cinelli parts:
