Its a KR-56. Measure the rectangular area that starts in the left back corner. An "add-on" carry tote (purchased separately) would go in that space. The KTR-1 tote was 20 1/2 x 8 1/2 and the KTA-3 tote was 20 1/4 x 8. If the space is big enough for the KTR-1 then, based on the available catalogs, it was made 1948-53. The smaller tote is in the 1955 catalog (1954 cat. isn't available). No catalogs are available for 1956 & '57, but in the '58 catalog the emblem is mounted in the upper left corner.
I just bought the same box and mine included the KTA-3 tote. I'm dating mine at about 1954-57.