145x61 with a wall thickness of 1,85mm.
I can't identify it. Not a section that I recognize.
Some additional info on my mast (2003)
I took cut-off I have of my own mast (2003) and that of another (halveway 1990's and now partly my mainbeam) to digital scales at the food section of my supermarket, these are annually calibrated by the national authority. The cut-offs are about a meter long so it is decent measurement. And I took the average of the readout on different scales.
Results after multiplying to full length :
My mast (2003) = 14.332 kg / 8.5 mtr
Used older mast (halveway 1990's) = 14.930 kg / 8.5 mtr.
Accuracy should be within a 100 grams amplitude around this average (< 1.5%)
On average the weight 1.721 grams/mtr = 14.631 kg / 8.5 mtr and that is consistant with other mast measurements that were send to me over time with the exception of course of the masts currently in Finland.
My mathematical model of the mast (developped in 2002) gives 14.229 kg/mtr = 1.674 kg/mtr. and is therefor consistant (meaning < 5% offset) with the cut-offs that I have at home.
Of course these measurements are for the bare mast tube sections, no fittings whatsoever.
Wouter