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I ride a 68cm and a 70cm frame now, so 72 is not a stretch. It looks like the seller has pulled the add from eBay and sold it. I would have bought the frame but wanted to find out more. I actually located the original owner and the mechanic who worked on the frame in 1984. The main frame stays (cable stays) were added in 1985 to stiffen the frame for loaded touring. I'm sad I missed the opportunity.
Can't help you really, other than to wish you luck with it. I saw the frame on the bay and the thought did cross my mind... I'm 6'5", but this is too big even for me. How tall are you and how are you going to ride it :-)? I'd not realised that cross-braces of the sort on your frame were a thing. Pic attached of a modern gravel bike with similar brace...sorry I cant help further.