Yes, only the very early Silvio V1.0 with a circular rear fork top, so the Titanium spring was bent around a hard point, instead of across the full width of the spring.
The S30 spring is twice as long and the spring moves 1/2 of the Silvio V1.0.
For a 15 mm wheel movement on the V1.0, with the Titanium 1.6 mm thick (Original 1.26 mm) spring only, requires 170 kg.f compared to the S30 of 5 Kg.f.
The S30 Titanium spring is there for location, and the Polyurethane spring takes the main load.
The S30 spring will not break due to over stressing!