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Re: Not perfect...?
In Response To: Not perfect...? ()

As a general rule 1st exec use the more rounded dome shape and later 2nd exec (inc the contrasting subs like 2447NST, which were intro circa 2nd Qtr 1968) use the more angular type crystal.

: So when they advertise them as "NOS Heuer" are they
: actually not? I assumed that all 2447s and 3647s would use the
: same crystal size, so there shouldn't be any variance on their
: end.

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