Those are late model TA track pedals... they are rather exceptional.

Was working out in my shop today and mounted up those SR 100 Al's to my 1954 Raleigh road bike... as a purist I should be using some English made pedals and I have some sand dust caps but from a functional point of view these are quite beautiful and suit the old girl.

They are also lighter than the old track pedals I was using.

In cleaning up my shop and going through boxes of parts I found another set of SR 100 pedals which are just a little narrower than standard road pedals, but wider than track pedals, and would be quite nice on a fixed gear.

When one is riding pulling up on the non driving leg is not very efficient for any period of time unless one is really hammering hard on the pedals as when they are sprinting or hill climbing... for skidding and brakeless adventures I can see the benefit of doubles as if one strap snaps you have a backup.

If a strap breaks while you are road riding you will just be inconvenienced... I often carry a spare strap as although I may never need to replace one on a pedal you can use them to lock a brake or secure a front wheel to the frame when you are making repairs.

Another interesting use for a toe strap was done by Sheldon Brown who used one as an actuator for a centre pull brake which would make one compliant with most brake laws... I tried this and it actually worked rather well.