Any info on a 1900 Mexican Contract

[LugerMan.com]

Hi,
I was asked of some information on a Mexican Contract Lugers...

All of the books that i have, only one has a 2 sentences about the Mexican Contract and no details of the specifics .

Is there a way to ID the contract ?

Where there only 1900 models or 1906 models as well ?

Any information will be very much appreciated.

A reference to a book source maybe ?.

Thanks.