Gazelle? Does anyone know anything about them?

For sure, the stem is too long for Bo Hamburger. I guess you have changed it to something that fits you.
I wonder that the frame suited him.
But I believe you. Not many other ex-TVM riders rode on the track.

You're right I changed the stem. I wouldn't mind changing it again for one that has more slope.
I'm 175cm, I'm not sure of his height exactly, can't seem to find it. It has Bo Hamburger stamped on the shell.

When I bought it was fitted with crankset, seatpost, stem & handlebar.