I have a cat watch and mines a screw-back watch therefore you need an instrument like on the link below to open it:
http://www.ebay.com/itm/Watch-Back-Case-Battery-Cover-Opener-Wrench-Screw-Remover-Repair-Tool-Set-Kit-/290996566159?pt=LH_DefaultDomain_0&hash=item43c0bf388f
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I am not familiar with Cat watches, but here are instructions for basic watch backs:
Locate a very small tab (or recessed area) on the edge of the back cover. This is the access point for removal. You can find this sometimes by running your fingernail around the back rim, as this tab or indentation can be hard to see.
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