Small piece of tarnished metal embossed with a boat in the center with a ruler at top numbering the sequence 150,160,170,180.
A coin sits next to a measuring tape near the 160 mark.
Gold coin right under some numbers on a ruler that say 160 and 170.
An old coin featuring a sailboat measure just under 20 mm.
A ruler above a coin has markings from 150 to 180 centimeters