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Country of Manufacture: Yugoslavia
Auction is for one matched pair (2) tubes of rare PC900 - 4HA5 EI Yugoslavia made back in 80s for export.
You can see them rebranded Siemens, Telefunken, Philips, Valvo and many others tube brands, that's why they come without prints.
Matched by plate current on my Metrix U61B tube tester.
See also my other auctions and visit my eBay store for more vintage tubes and tube parts!