I can make a case for Tulloch having won 16 Group 1 wins retrospectively on the basis of the names of the races first classified as Group 1 races in the 1979-1980 year. I could also make a case that the total should be discounted back to take into account that there was a proportionately smaller number of horses competing for each notional Group 1 race in Tulloch's period than is the case today.
The 16 retrospective or notional Group 1 wins I have identified are as follows:
'
Position Date Margin Track Race Name Conditions
1st-6 9/03/1957. 0.5L x 2.5L Flemington, Melbourne, VIC, AUS VRC Sires' Produce Stakes 2YO SW
1st-3 20/04/1957. 2L x ½ nk Randwick, Sydney, NSW, AUS AJC Sires' Produce Stakes 2YO SW
1st-7 21/09/1957. 4L x 0.75L Rosehill, Sydney, NSW, AUS STC Rosehill Guineas 3YO SW
1st-5 5/10/1957. 6L x 8L Randwick, Sydney, NSW, AUS AJC Derby 3YO SW
1st-14 12/10/1957. 8L x 0.75L Caulfield, Melbourne, VIC, AUS VATC Caulfield Guineas 3YO SW
1st-17 19/10/1957. 2L x 1L Caulfield, Melbourne, VIC, AUS VATC Caulfield Cup Open Hcp
1st-8 02/11/1957. 8L x nk Flemington, Melbourne, VIC, AUS VRC Victoria Derby 3YO SW
1st-4 16/11/1957. 7L x 10L Eagle Farm, Brisbane, QLD, AUS QTC Derby Stakes 3YO SW
1st-4 22/03/1958. 3L x 2L Rosehill, Sydney, NSW, AUS STC Rawson Stakes WFA & Allces
1st-4 09/04/1958. 0.75L x lg nk Randwick, Sydney, NSW, AUS AJC All-Aged Stakes WFA
1st-4 12/04/1958. 1.5L x 2L Randwick, Sydney, NSW, AUS AJC Queen Elizabeth Stakes WFA
1st-4 13/04/1960. 1.25L x 6L Randwick, Sydney, NSW, AUS AJC Queen Elizabeth Stakes WFA
1st-15 22/10/1960. 0.5L x 3L Moonee Valley, Melbourne, VIC, AUS MVRC W.S. Cox Plate WFA
1st-8 29/10/1960. 0.5L x 2.5L Flemington, Melbourne, VIC, AUS VRC L.K.S Mackinnon Stakes WFA
1st-6 29/03/1961. 4L x 3L Randwick, Sydney, NSW, AUS AJC Queen Elizabeth Stakes WFA
1st-11 12/06/1961. 1.75L x 2.25L Eagle Farm, Brisbane, QLD, AUS QTC Brisbane Cup Open Hcp
I note that while the VRC Sires was graded as a Group 1 race in 1979-80 it was subsequently downgraded.
Cheers