Sterling AX4 SUB Question

I recently was able to pickup and AX4 in black translucent finish. Mine has a locking Floyd Rose tremelo and has a locking nut. When I try to look this up for information most of the AX4’s I see don’t have the locking nut. Is there an official model number for this? Also I’ve read where these were made for Ernie Ball and in fact mine has the original plastic film on the tremelo cover that has a sticker that says “All Instruments Inspected Set-Up and Shipped from Orange, CA.-USA”. It…

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