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I missed the "Smirk", my fault.

1971 was a transition from Smirkless to Smirked.
1971 ................. 2A5601 thru 2A7800 (Don't know total for smirk in 1971)

1972 were all blue and Smirked
1972 ................. 2A7801 thru 2A9999 (2198 total for 1972)

Can't tell you how many of the 1971 were Smirked or not other then what we have in the links I gave you above.
2A5320 was one of the last 1971 Smirkless hulls in a series.
However, 2A6619, 2A6648 seems to be mingled in there among others for 1971 Smirkless hulls that are also shown.
The last Smirkless we show is 2A7124

2A5777 is one of the first Smirk hull that we show in 1971.

2A7480 is the first 1972 hull and the last listed is 2A9397 which would equal (9397-7480) = 1917 smirked hulls for 1972
Probably a lot more than that in reality.