Master Lock name unknown

[lynxboy]

Does anyone know the series number/model of this master lock?
As you can see, it's a combination padlock. They are used mainly in schools for lockers.

[bumber]

model 1500 looks like those but I dont think they have the keyway in the back of them because they boast "for keyless convenience"

[lynxboy]

Actually I think it's the 1502 series. It's got the same dimensions of the 1500.