Found a used Galco rig at a gun show (no original packaging) with a sticker labeled "Sig P226." Slipped my 6906 into the holster and it fit very well.

Holster component was stamped "248."
2 Magazine component was stamped "SCL22."
(Above stamped numbers confirmed through Galco website for Sig P226 holster.)

Excellent compatibility with my early 6906 with square trigger guard.
Also perfect fit for my S&W 5904 w/ square trigger guard.