I have a Zenith 2552 pc movement, mounted in what i believe is a Zenith pilot case. The movement is perfect and keeps time brilliantly. The case is however shoddy, and i know that the case and movement are a marriage. Its hence my long term goal to track down a decent case. I was wondering which cases were originally fitted with this movement. From snooping around the web, I think it was the sporto and the respirator. Is that correct? And were there any others? Thanks in advance.