Four Seasons - C’mon Marianne

June '67 was right around the time Philips was transitioning from the black label to the blue (though some singles were released on the older black label even into 1968..."Will You Still Love Me Tomorrow" by the 4 Seasons was one).
I would say that a black-label copy is an early pressing of the song, a blue-label would be a later pressing. I'm not aware of any mix differences between the 2.

Tough to determine which one is the correct 45 version as it appears there were two mixes. I guess it depends on when you bought it. I don't have the black label copy but I have three blue label copies, 1-40403-4 and 1-40403-6. Both with a label time of 2:32 and a run time of 2:39.

My understanding is the black label copies, or at least some of them match the mono LP mix which may just be a stereo fold down. I don't hear much difference.

The difference on the blue label copies (compared to the mono and stereo LP mixes):

The Marianne vocal segment at the start of the song has a longer pause from where it ends and when the guitar begins.

Sections of the instrumentation sound like they've been pushed through a heavy reverb unit. And overloaded.

What Pat notes: When the middle section of "Marianne" singing ends at about 1:18 and right before the music pitch change, it sounds like the background singers go "ohhhhhhhhh" downward a bit on the 45. You will not hear that on the stereo LP version.

During 1:15 to 1:20 it sounds as if the "Marianne Marianne Marianne" section overloaded either the mixing board, compressor, reverb, or all three as there is a scratchy/white noise sound in there, which sounds like cue burn but is on every copy I've found of the blue label version. It stops right before the "ohhhhh" that Pat notes.

Strings near the end just "pop" in, they don't fade in.