Bersa Thunder 380 on ammoclip.com
may work. Looking at ammoclip.com - The "Bersa Thunder 380, .380ACP, 7 round, nickel body with chromed steel follower and poly finger rest, factory-new" looks extremely similiar to the mag that came with my Model 83.
A little conturing of the mag body adjacent to the front sides of the follower would be required. The holes are the same as is the little "lip" on the extreme lower side of the magazine body. The wording is also the same and in the same location.
I ordered one from Condorsflight.com for $27. I'll let you know how it works out.
Great input - thanks, Bill