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not regular BSA!
diameter is same as BSA but thread is metric, not inch standard and thread should be recut. If you don't recut it then in future you will broke it... But you can do it without recuting. On standard production frames like Start Shosse (or other city KhVZ frames) it works and they are made from "pipe" steel. But standard track models, like this one- Rekord, was made from better steel, and you can damage thread if you will not recut before...seat post size on standard production frames are 25.0, also on Rekord.
Speczakaz frames (Sport, Sprint, Meteor)- 26.2mmand headtube inner diameter is different, you'll need a shim
JC_Chapi
Regular BSA. Just lot of grease, leverage, good quality tools and patience. :)