ASL sign for: if

Introducing a conditional clause; used to talk about the imaginary result or effect of something that may happen or be true; used to say that something must happen before another thing can happen

Fingerspelling loan.

This old ASL sign appears to be less used, if not obsolete, these days than the other variations above.

Hmm, no words found now but, hey, it doesn't mean there is no expression for this concept in ASL.