Coin obverse and reverse faces and mechanical clock: what they have in common

1. Step 1. Coin obverse and reverse faces — is part of — Coin. Front and back with pictures.
2. Step 2. Coin — is made of — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Step 3. Gold — is material for — Wristwatch. The case is gold or silver.
4. Step 4. Wristwatch — is a kind of — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.

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