The picture below shows a larger view of all (5) Matching Old Nik-O-Lok Brass Restroom Token Coins in this lot. These are identical and both sides are shown. These are not dated and the years that they were made is unknown. These were used in a lock mechanism either on a restroom door or on a stall door inside. They are marked on the two sides as follows:
NIK-O-LOK RESTROOM TOKEN INDIANAPOLIS, INDIANA HELP KEEP OUR RESTROOMS CLEAN
The tokens each measure about 5/8'' wide. They appear to be in good to excellent condition as pictured.