Not the actual bike, but it looks like that.
The Toaster tank and the 73 are interesting to me.
By the early 70s Japanese bikes had really started to catch on in the US market.
BMWs had traditionally been “any color you want as long as it’s black,” with not too much chrome and big boxy gas tanks.
To counter the Japanese, in the early 70s BMW introduced some bright colors (the blue above, green, red and some others) and added more chrome bits.
But the most controversial and boldest (for a conservative company like BMW at the time) was the nicknamed Toaster tank (because with the chrome panels it looks like a toaster). Smaller and sleeker than previous tanks, it also had the big chrome panel you see. It was for the most part poorly received. Both for its looks, and it’s reduced capacity. Many were swapped out for traditional tanks on the showroom floor. It only lasted a year or so before it was discontinued.
It’s become desirable by many now, I think because of the story and historical anomaly, but also maybe the looks? (I like look better than the standard tank).