I wish I could find the exact statistics on these chips as I had them at one time.
This was not exactly a popular chip at the time of sale so as a result a very large number of them were destroyed.
The original production numbers were 5,000 of each, I know that on at least 5 of the issues in excess of 3,000 of the chips were destroyed.....Rare? perhaps not but much fewer of these around than many other A/c chips