The L410 (NR15A) design dates to 1929. The label dates the box to 1936. The cardboard box is a two part carton with and inner sleeve. Designed for protecting service valves and not for retail sales the identification is on a simple printed piece of paper stuck onto the carton. The cardboard inner holds the valve first in wadding and then with a corrugated card wrap. The box is 75 mm square and 134 mm tall.
 
 
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