NFL Chain Crew practice on goal to go in 1970s

[wescovington]

I was recently watching Super Bowl V (1971, Colts over Cowboys 16-13) on YouTube and on 1st and goal situations, the chain crew still marked the line to gain. In one situation, it looked like the Colts were 1st and goal at the 5 and the crew on one side set down the line to gain stick in the end zone. On the other side, you could see the field strip placed in the end zone.

I noticed this for Super Bowl VI as well. I couldn't find a good Super Bowl VII or VII broadcast. In Super Bowl IX, they were using the LTG marker for a 1st and goal, but placing it at the goal line.

Does anyone know when it became standard practice to just use the down box alone on goal to go situations?

[zebrablog]

Interesting first post, wescovington

I'll be honest, I never noticed that before. It doesn't make a lot of sense, even to have the front stake on the goal line, because players might be confused if the line-to-gain is in play near the goal line. 

I pulled an example from Super Bowl V, which is at 58:14 if it doesn't load to that point.