
これば is not correct Japanese. See http://japanese.stackexchange.com/questions/18235
It should be くれば.

I know some people who say これば. I think it's a dialect.

I think it should be tagged as "dialectal" in this case.

Tagged "dialectal" and "non-standard grammar".

@tommy_san @Selena777 Thanks :-)

It seems that これば is used (among others) in Hyogo.
http://togetter.com/li/34861
Tanaka Corpus was made by the students of Hyogo University.