If you look closely at the helmet on the graphic, you’ll notice the subtle black trim on the SF logo on the helmets , an addition which lasted until the 1995 season and the final season the team wore screen printed numbers on jerseys. This season was special though, not only did Montana basically break every NFL record imaginable, the team steam-rolled the whole NFL on it’s way to the 4th straight super bowl.
Jan 28, 1990 the Denver Broncos and the SF 49ers squared off in the Super Bowl for world wide supremacy (spoiler : the Niners won it all). According to Wikipedia, “This game remains the most lopsided game in Super Bowl history. San Francisco's 55 points were the most ever scored by one team, and their 45-point margin of victory was the largest ever. The 49ers are also the only team to score at least eight touchdowns in a Super Bowl and at least two touchdowns in each quarter (the only mistake was a missed extra point attempt).”