The various types of keys used to open Home Safes and Thrifty Boxes are shown above against an 'Inch Scale'. Left to right, the keys were used as follows:
[1]
[2]
[3]
[4]
[1] Original type of Home Safe
[2] Book type of Home Safe
[3] Nickel finish Home Safe
[4] Thrifty Box
Two different patterns of key bow - one key
with the initials 'MK' - presumably the manufacturer