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In Japan we get ISIN data with http://www.isin.org/isin-database they have free search tool.
On the website interface, you can get a CEF's NAV by circumfixing X-...-X (prefix & suffix) to the ticker. For example, the NAV time series ticker corresponding to the PDI price series is XPDIX. Or, XBTZX (NAV), BTZ (price). That might work for you.
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