
McVitie Weston valve collection, Osram valve, type P610
1933
1933
1927
1930
1930
1929
1923
1926
1923
1927
1930-1940
1935-1950
1925-1940
1931
1931
1924
1924
1930
circa 1932
1928
1946
1948
1930
1930
1930
circa 1937
circa 1932
1945
1921
1945
1945
1945
1945
1946
1934
1921
1934
1923
1923
circa 1924
circa 1928
1924
1928
1930
1929
1922
1922
circa 1922
1922
1929
1949