Sturmey archer hub question

[Johnnyandluther]

This a pretty obvious question, but I'm an idiot . I have an old rudge with a sturmey archer hub, and I need to get the gear chain for it. Where am I looking on the hub to know what model chain I need to get for it? Any help would be appreciated.

[xerxes]

Try here: http://www.sjscycles.co.uk/sturmey-archer-indicator-mk3-hsa315-prod8326/

There are some links in the product description that may be helpfull.