Actually, the original material of the tailpiece that we associate with most Rick basses from 1962 to 1974 was chrome-plated cast aluminum. In 1974, it was redesigned a bit and made from cast zinc. It has had some minor redesigns over the years, but is still cast zinc and chrome plated. Don't know the composition of the Schaller tail/bridge parts.
It appears that the GF bass has the Schaller bridge, but I mis-identified it as the ABM bridge in the book. The Schaller was the standard bridge used on the earlier 2030 and 2050 basses. When the later design 2020 and 2060 were introduced in 1992, they switched to the ABM tail/bridge. RIC went back to the Schaller tail/bridge in 2007.
The Glenn Frey bass was introduced in 1992 before the 2020/2060. It most resembles the 2020 but for the special trim treatment, the earlier tail/bridge, and the designator, 2030. It's not clear exactly how many were made, but the plan for the Glenn Frey editions (guitar and bass, evidently) was to be 1000 total, but it appears that production was not reached. The bass was listed only through 1995, while the 230GF guitar went to about the year 2000. I doubt there were more than 100 GF basses made.
