Does anybody know which single-sided safety this is that Springfield used on their 1911's?

(Image borrowed from a CalGunner's sale thread)
It kind of looks like the Colt single-sided safety but is considerably more low-profile. I thought maybe Springfield was modifying the Colt safety, but that seems ridiculous considering they wer using them on production guns.

(Image borrowed from a CalGunner's sale thread)
It kind of looks like the Colt single-sided safety but is considerably more low-profile. I thought maybe Springfield was modifying the Colt safety, but that seems ridiculous considering they wer using them on production guns.

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