[Lugers down under]

I have the opportunity to purchase a Siamese Luger dated 1936 and has the Mauser banner on the toggle.
Siamese acceptance marks above the Lanyard loop.
I have no photos yet as I have not yet seen the gun but understand it is good condition.
I can find very little information about the Siamese contracts other than what is on page 246 of "The Luger Book" by John Walter.
Can anyone shed some light on this contract and also give me some idea of value range.
Regards
Murray