I must have had a "history" moment because in my search for production numbers on the Spirit and SX/4 models, I was not able to find a good source for the "Kammback" name. Therefore, I wrote the following: http://faculty.concord.edu/chrisz/hobby/80-AMXitems/Information/production/KammbackStory.html Please let me know how to improve it. Morerover, I would like to have complete production numbers (and any factory optional equipment data) to complete this page: http://faculty.concord.edu/chrisz/hobby/80-AMXitems/Information/production/production.html Please send to chrisz@xxxxxxxxxxx Thank you, Chris Z.