blind man joke?

blind man goes for a job in a timber yard, he hands his application to the boss and is met with the reply that he couldn't give him a job as he couldn't tell the difference between the various types of wood. The blind man explains that when he lost his sight, his sense of smell improved so much that he could tell the difference between the types of wood by its sense of smell. the boss said that he would blindfold him and if he could indeed tell the difference by smell alone the job is his. the man was blindfolded and first piece was put under his nose, elm he said, right, next peice oak, next peice teak, next mahogany.. all correct. the secatary said l'll catch him out, and pulls down her knickers and lays on the table in front of him, he takes a good sniff and declares he wasn't sure, take another sniff the boss said, still no good the blind man said, turn the peice of wood over and try, the lady turns over and he tries again... got it he said IT'S A TOILET DOOR OF A RUSSIAN TRAWLER.