A later magazine with four holes in each side and a fingernail slot placed a couple of millimeters from the base.  It is marked with the caliber designation.  Serial number unknown.

A later magazine with four holes in each side and no fingernail slot.
Serial number unknown.

A pair of later .380 magazines from SN 74213.  On the right is the extended magazine which held an additional two cartridges.  Neither has a fingernail slot.  The extended magazine was an accessory that could be purchased separately.  They are extremely rare today.
From the John R. James collection.

A .25 caliber magazine from SN 33292.  It has four holes in each side and no fingernail slot on the front and is marked CAL. 6.35.

A .32 caliber extended magazine from SN 3038 with six slots for
viewing cartridges and the proper finger-hold at the bottom.
From the C.L. Webb collection.