[Samba] Values for Create Mask?

We're running Samba 3.0.4.0 on AIX 5.2 and I am using the create mask
value in the smb.conf to try and set the default permissions but I can't
seem to get the values right.

I want the default permissions to be rwxrwx---

Setting the mask to 770 gets me rwxrw----=20

I've tried several options but can't seem to get the execute value on
the group.

If someone can either let me know what the value should be set to, or
point me to a good reference page for this, I'd greatly appreciate it.

Thanks so much

Tony=20
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