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That's a bad angle to compare, but at first glance I'd say that's either a PX27 5.6v Mercury battery (discontinued, unlikely), or one of it's non-mercury replacements (PX27A 6v Alkaline or PX27S 6v Silver Oxide -- sometimes identified as "S27PX", "V27PX", etc).
They're used in cameras, and a dedicated camera shop/department would be your best bet in finding a match.
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