I think that I have worked out the saga of the 1972 Tuis in F2 and Atlantic
According to MN 27.7.72 p.18 Murdoch used the original Hawthorne FB car AM29 from 1971 in UK Atlantic in 1972. Watson is using the BH2 with an additional car completed but not yet built up.
So in 1972 McCall has
AM29 1971 car for Atlantic, loaned to Murdoch in late June, having first been used by Watson in F2 until the new car is built up [at least at Crystal Palace].
"BH1" retrospective appelation for the car in which Hawthorne is killed at Hockenheim
BH2 [later BH2-2] Watson's 'proper' F2 car
BH3 [later BH2-3] parts car
In 1973
the AM29 car sits in the garage and is eventually sold off to Switzerland
BH2-2 becomes Murdoch's Atlantic car [all the descriptions of it as ex Watson are in 1973]
BH3 [later BH2-3] appears as a brand new car for Tom Walkinshaw at the British GP support race
BH2-3 and BH2-3 are then taken to Canada 1975, with EFR using chassis 2 in 1976 and Gloy chassis 3
Chris
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