The 13x18 plate back with the Linhof Munchen oval logo dates from 1950-1953 and was replaced with a fixed spring back until the IV in 1957. The IV back was improved over the early style spring back.
The gunmetal grey/black back arrived with the V model in 1963 but was originally tan. The dark grey appeared about 1983 and remained until 5x7 Technika production ceased in 1986.
so 30-36 years between backs...
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