This clock was made in the 1970s out of slabs of vintage Panama Railroad ties and Panama coins, The manufacturer was a man named Earl Hataway, a Panama Canal employee who lived in Gamboa and worked in the Supply Division. The base slab is one inch thick. The face slab is a little less than 1/2 inch thick. Eight 1975 2.5 centavos coins are glued to the face of the clock between the Roman Numerals III, VI, IX and XII. The clock mechanism is a powered by a C cell battery and there is a second hand. My mother sent me this clock for Christmas in 1980. I used the clock for a couple of years and then packed it away during a move and only found the clock recently. I put a C cell in the back and set the time. The clock worked just fine. A wonderful railroad collectible from the old Panama Canal Zone.