A does not equal AOB unless I missed something in elementary school.
Decals are 92, fork is 92, MC1 cap does not say Klein, should I go on?
See this is why you should have just said Klein for sale, price and go on about it. Instead of trying to debate way out of your comfort zone.
The OP suggests this may be a 1990 frame built up for sale in 1991 so the plain cap is entirely consistent. Same would apply were the forks to have been a replacement. Decals are hardly a great indicator as there was not a 100% consistency, I would take a frame number as indicator of when a bike was made, then other variables to indicate when it was sold.
Seller seems to be fairly straight with this and it is a good price.
I don't get the reasoning behind the tone of the negative posts.
Maybe it's just a Klein fan boy thing.
The doctor diagnosed me with hereditary diarrhoea. I can't understand, I wear a kilt.