Oregon roller to 3 rivet tip to one rivet tip

[Bigmac]

Like the title says, dose anyone know the year Oregon went from roller nose,to 3-rivet and to one rivet tips. Just curious for history, and I have looked high and low and can’t find any answers! On many vintage saws it would be cool to know, so you could keep it period correct! Thanks in advance!

 

[Jon1212]

@ray benson @jacob j.

 

[ray benson]

1984 Oregon application guide shows 1 and 3 rivet sprockets.
1975 Oregon application guide shows 3 rivet sprockets .

 

[chipper1]

1984 Oregon application guide shows 1 and 3 rivet sprockets.
1975 Oregon application guide shows 3 rivet sprockets .

 

[Bigmac]

1984 Oregon application guide shows 1 and 3 rivet sprockets.
1975 Oregon application guide shows 3 rivet sprockets .

Thank you!! Have been super curious!

 

[Jon1212]

1984 Oregon application guide shows 1 and 3 rivet sprockets.
1975 Oregon application guide shows 3 rivet sprockets .

Thanks for coming through, again.