Pin Tumbler Padlocks
U

Click to Enlarge Image "U.E.L. & P. CO.". 2 3/8" high x 1 5/8" wide x 3/4" deep. Brass case. Brass shackle. Made for: Union Electric Light & Power Co. Mfg by: Yale & Towne Mfg. Co.
"Courtesy Neil Pylant" 
2216
Click to Enlarge Image "UNIVERSITY OF COLORADO". 2 11/16" high x 1 3/4" wide x 3/4" deep. Brass case. Steel shackle. Mfg by: Yale & Towne Mfg. Co.
"Courtesy Neil Pylant" 
2191
Click to Enlarge Image "PROPERTY U. OF MD.". "University of Maryland". 746
Click to Enlarge Image "U.S.". 742
Click to Enlarge Image "U S BONNEVILLE PROJECT" - "YALE". Brass case. Steel shackle. Made for: United States Bonneville Dam Project. Mfg by: Yale & Towne Mfg. Co.
"The Frank Kidd Collection"
6219
Click to Enlarge Image "U. S. R.". Size: 4B62. Padlock Stamp #: 0522-E. Color: Green. Made for: U.S. Rubber Products, Inc., Detroit, Michigan. Mfg by: Best.
"Courtesy Neil Pylant" 
2334