I have a contemporary E series MIJ that I bought new from Sam Ash in the 1980's.
The other day I decided to take the pick guard off to clean the inside with an air can cleaner. However, I was very surprised to see the pickup routings....This guitar has 2 single coil and 1 humbucking pc. Yet, the routing was for 3 humbucking pickups.
Do I have a rare MIJ Strat?

I believe the correct answer would be....No.

_________________
Marriage is like playing cards...

At first all you want are Hearts and Diamonds.

But in the end, all you really want is a Club and a Spade.

I also just found out that I don't have the model #27-5700. Wikipedia is calling it the Unknown model. Read the last one:

27-5700: 2 single coil and 1 humbucking pickups, 5 position selector switch, coil splitter, 1 volume, 1 TBX, System III tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-5800: 2 humbucking pickups, 3 position selector switch, coil splitter, 1 volume, 1 TBX, System III tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-4100: 2 single coil and 1 humbucking pickups, 5 position selector switch, coil splitter, 1 volume, 1 TBX, System II tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-4200: 2 humbucking pickups, 3 position selector switch, 1 volume, 1 tone, System I tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-4300: 3 single coil pickups, 5 position selector switch, 1 volume, 2 tones, System I tremolo, rosewood fingerboard, 25.5" scale length, top mounted output jack.
27-4302: 3 single coil pickups, 5 position selector switch, 1 volume, 2 tones, System I tremolo, maple fingerboard, 25.5" scale length, top mounted output jack.
27-4400: 1 humbucking pickup, 1 volume, system I tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-5000: 2 humbucking pickups, 3 position selector switch, coil splitter, 1 volume, 1 TBX, System I tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
27-5500: 2 humbucking pickups, 3 position selector switch, coil splitter, 1 volume, 1 TBX, System I tremolo, rosewood fingerboard, 25.74" scale length, side mounted output jack.
27-5400: 2 humbucking pickups, 3 position selector switch, coil splitter, 1 volume, 1 TBX, System I tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.
Unknown: There is also an unknown model number featuring 2 single coil and 1 humbucking pickups, 5 position selector switch, 1 volume, 1 TBX, System I tremolo, rosewood fingerboard, 25.5" scale length, side mounted output jack.