Im guessing it's quite old,,,,,but I still see many coolers that the hanging rails (or what use to be there) was cut out above the door which this door doesnt have a cut-out- I see a corner of a stainless steel handwash sink, so maybe the sides didnt roll out this door. (or in)
By the look of the door it can be 40 plus years old
Id say late 30s mid 40 s My grandfather had one in his shop,not with the side windows, only door windows and if i can remember clearly it had wood panneling on the sides and on the door
I use to travel to most of the independent stores in maine, that had meat departments, and some of these stores were over 100 yrs old. Id see pics thru the years, and one of the very few constants seemed to be a cooler door- the older ones ive seen(personally) had been first national and A&P cooler/doors= very thick wooden doors with heavy latches,,, and wooden coolers. One particuler independent store has been in business since the 1870's and pics thru the years, almost put the cooler door in the 1920's if not before, but then I get hung up on refrigeration and when that came into play, al old timer once told me, an old timer told him, they use to use blocks of ice in the meat lockers-and alot of sawdust, before the refrigeration units. then this could put coolers into play wayyy before the 20's and 30's
mainemeatman, I started with a company called Greer's and son's in Fairhope, Al. in 1953. After being with them a year I actually worked in a old store, Green's Grocery, Fairhope, Al. part time in 60 & 61 that had a cooler that used the big 50 lb ice blocks that went in over the door, there were three little doors up there, the ice man would load each door with 4 blocks each, old cooler stayed cold to.