METAL CASE POLISHING
Brass and silver cased clocks, in particular, are subject to oxidation and tarnishing due to reaction with the air, pollution and moisture therein. Most cases were originally lacquered to prevent the deterioration however in many cases this lacquer breaks down with time or is polished away.
These cases may be returned to their original glory by removing traces of old lacquer then polishing and re-lacquering.
1. 4-glass brass cased clock, c.1905
2. Copper cased 400-day clock, c.1915