OK -- back from tuning my Hofner Icon to A=435. And indeed, I AM in tune with the entire "Please Please me" LP. So our friend who suggested 435 may be right. However, when you move on to "With the Beatles" through "Abbey Road," it's A=440.
"What are the frequencies of musical notes like G and G# in khertz?" The answer:
There are two accepted musical pitch standards, the so-called American Standard pitch, which takes A in the fourth piano octave (A4) to have a frequency of 440 Hz, and the older International pitch standard, which takes A4 to have the frequency of 435 Hz. Both of these pitch standards define what are called 'equal tempered chromatic scales.' Mathematically, this means that each successive pitch is related to the previous pitch by a factor of the twelfth root of 2. That is, the ratio between the frequencies of any two successive pitches in either standard is 1.05946309436. There is a third Scientific or Just Scale that is based on C4 having a frequency of 256 Hz, but this is not used for musical purposes.
This is contrary to what I thought I remembered and had been told by people who have played in orchestras in Europe-- that European pitch standard for A was higher than American.
This doesn't explain why they chose A=435 for "Please Please me" but went to A=440 for the rest, but it does explain the initial tuning question.