sounds like the "Y" style is correct for ealry 71's, not sure for all 71's and i think the mechanism is more like the 1st pic im my original post though as i & 68bird point out, that is probably not correct itself, just similar, which i like to hear. i've seen jacks like my 2nd pic identified as f-bird & i have not seen anyone confirm that it is.
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71 Formula 400, Castillian Bronze, Saddle Interior:
https://youtu.be/cfEv-1vKc0k
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