Thank you very much ezfishn!
Yes, sure I checked Humminbird site. Didn't give me understanding if if 4087201 and 408720-1 is the same though. 408720-1 is correct part number, but 4087201 looks like it might be correct too.
The seller sold his first unit for 1195$, second for 1222, now the third for 1302$ Can it be real?
He answered that he can't provide serial number, because he ships directly from a drop shipper. I'm so undecided what to do:(