The first Y in the frame number shows it to be from 1957 but there is no YY. A single Y, yes plus YC, YM, YB plus YTM and YSM but no YY.
Your engine number is not quite right either.
If you give the bike a really good clean and look closely you should be able to pick the numbers out a little better. They can often be awkward to read.
Do not trust any paperwork numbers.
No trouble identifying it with the right numbers.