With out information as to size, hp, band color on the cover, serial number or photo , no one will be able to answer that question
you can go google and type in--- identifying mercury outboard models and types and power ranges --
there are sites that I found quite some time ago from mercury that was pretty good and if you have a serial number and horse power , you may get the answer
of course you could always take it in to a service dealer and have it identified