This one is coming up for auction....and there's really no excuse for it.

Aside from the fact that what is supposed to be Bud Abbott's signature is a complete mess. The Lou Costello is a fairly good attempt at one of his recognizable styles. 

The JSA LOA states that Bud and Lou signed this in Liquid Ink Roller.

Lou Costello died in 1959.  Bud Abbott in 1974. 

These Liquid Ink Roller "signatures" look as fresh as James J. Spence Jr.'s signature on the accompanying LOA that was created just a few months ago.

https://weissauctions.nextlot.com/auctions/1769663/lots/44532027