how to determine year of ls170

[allstarconstruction]

just bought a used ls 170 and trying to find out the year of the machine. any websites you guys can suggest to determine that info. thanks in advance

 

[skidsteer.ca]

I thought my 160 had a year on the injection pump tag.Dealer can tellyouwhen the machines serial # says it went into service, and any work that Nh did to it.
Ken