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E, DanielI agree with you completely that the card is now a whole different proposition in terms of its future value. The coupon being clipped off is a totally accepted version of the card as this happened more often than not and collectors know the history, and indeed having the card with coupon is almost a variation that has more of a multiplyer effect - with the sans coupon a standard version.
The only problem you have was accepting SGC to slab it once you knew about the color added.......obviously you should have kept it in the psa slab and sent it into SGC that way (mighty ballsy of you to crack it out I must say!) and then you had two avenues for mediation, mastro and psa. Now it is hard to argue its provenance and being free of tampering from sources other than Mastro or PSA....
I would guess value at 50%-70% as an ink added, as opposed to minus coupon.
Definitely a beee-utch.
Daniel