Amerigo vega sizes?

[charliebo]

Does anyone know what 2 + 1 1/2 means when stamped on a Vega saddle?

Any help gratefully received

 

[CastleMouse]

I think + 1 1/2 means that it's medium wide, and 2 is the flap size? Not certain though, sorry.

 

[charliebo]

That's what I thought too. looking at a 2nd hand one and have been told it is a medium but has + 1 1/2 so I have got confused