The picture of the OP fork looks to me to be one of the early squared off crowns which were part of a CPSC recall from what I remember. Funny thing is we continue to see these forks on bikes posted here that are being ridden and also forks that are being sold used in a number of locations. Have received a few on bikes I've purchased. Now hanging on my wall of forks. Here's a link to the original recall from 1995:
http://www.classaction.org/rock-shox-ma ... -4705.html
Product Name: Rock Shox Mag Mountain Bike Suspension Forks
Manufacturer: Rock Shox
Product Type: Bicycles & Accessories
Safety Risk: Fall
Alert Date: Thursday, June 22, 1995
More Information: CPSC Alert
CPSC And Rock Shox Announce Recall Of 1992 Mag 20 And Mag 30 Suspension Fork Crowns
WASHINGTON, D.C. - In cooperation with the U.S. Consumer Product Safety Commission (CPSC), RockShox, Inc. of San Jose, California is voluntarily recalling 21,000 fork crowns on some of its Mag 20 and Mag 30 mountain bike suspension forks. The crowns may crack, causing a rider to lose control of the bicycle and fall.
RockShox has received 2 reports of incidents resulting in alleged personal injuries. Although these injuries were minor, there is potential for serious injury.
The RockShox forks, made only for mountain bikes, were sold as original equipment on some bicycles and as after-market equipment for other bicycles for about $330 to $390. The suspension forks with the defective crowns were sold through bicycle retail outlets worldwide. The Mag 20 and Mag 30 suspension forks have bright nickel finish and a "ROCKSHOX/MAGNESIUM" decal on the front of the fork. Forks with serial numbers 27266 through 158841 are involved in this recall. Forks with a dull bronze finish are not affected by this recall.
Consumers who own recalled bicycles should stop using them immediately. Consumers should check the left inside of the fork for the bike's serial number, then contact RockShox at (800) 694-0668 to determine if the fork crown is involved in the recall. If the fork crown is involved, RockShox will provide a UPS shipping authorization and the fork can be shipped free of charge to RockShox for a free replacement crown. Media inquiries should be directed to Chris Smith at (40

232-7414.