Terribly OT - Zeiss TeleTessar 4/300

Any Zeissites/Contaxites out there who know anything about the Carl Zeiss Tele Tessar T* f4/300mm ? (Made in Germany)
I'm being offered one in more or less mint condition for around 500 euros, but I seem to remember that there were two versions, and I'm not sure which one this is.
One version has a straight barrel and a cylindrical head, the version I'm looking at has a long fat barrel with conical tapering towards the camera end of it.


Any experience, warnings, flames or odes to this piece of equipment would be very much appreciated
TIA
Douglas


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