Using star and fsr

The man page for star alludes to being able to start from a place other
than the beginning of the archive using "mt fsr blockno".  I have tried
a number of combinations and they all end with an error:
 
mt -f /dev/nst0 rewind
mt -f /dev/nst0 fsr 1
star -v -x f=/dev/nst0 *
 
star: Unknown archive type (neither tar, nor bar/cpio).
 
Has anyone else had this work and can tell me where I am going wrong?  I
used to use this with tar.
 
 star 1.5a08
 RedHat AS3
 Both HP DLT1 and Certance LTO2
 
Thanks,
Wayne.