Original tires on 1975CB750F

[KA750]

hello folks, am wondering what tires came new on a 1975 CB750F?
Are they Bridgestone Spitfire sport 120/90 V18 and 100/98V19?
the DOT code is DOT EMN5, does that indicate 1975?
thanks for any help

 

[BB74]

1975 CB750 had 3.25-19 on the front 4.00-18 on the back. They used a older style of sizing specs for tires back in the 70's.