The best guide is to monitor this page on Bachmann's website. Once Bachmann think they are going to get a particular model, it gets a pair of months in the expected delivery column. This works for some models - like the 9F, but can be way off for others - such as the Fairburn tank. The model you seek currently has an "awaiting" status, so don't hold your breath.
There have been quite a few threads in the past about Bachmann and their delivery schedules.
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