That’s an awesome collection! Really like the older panels like the 4208 and 2001 (hope to get them at some point). I have a lot of Simplex panels myself: 4001 to the 4010 inclusive. Didn’t realize the 4051 had a higher current version; I was wondering why my 4051 was super loud.
I have pictures of my panels in my collection post: Fire Alarm Collection - #19 by dewpoint8900