There are those who feel that there is no such thing as 'clubhouse' - autographs are either real or forgeries. That thinking probably is the result of auction houses selling balls that have a forged 'Ruth' crammed onto them, as 'authentic' except for a 'clubhouse' Ruth.
Most clubhouse signatures don't look very much like the real thing - if it looks like an attempt was made to copy the signature but it isn't real, then there were probably shenanigans going on and AH's (and/or TPA's) that call such stuff 'clubhouse' should be called out for it.
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