In the codes used below the combination OP stands for oval, portrait orientation. It is followed by the rounded size of each model in millimeters. The sizes have been derived from the original trade names used by the Verwoerd workshop, and actual sizes may differ by one or two tenths of a millimeter. The silver mounted model OP10x14.5 is an example of the many variations produced by Schoonhoven silversmiths. The caption also has the number of pieces sold, and the years in which they have been produced. Although we believe that these figures are a useful indication of the relative production sizes, they may be subject to change on the basis of further research results.
Oval - portrait
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OP 13x18mm
14700 pcs
1960-74
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OP 11x24mm "Ring"
7850 pcs
1962-66
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OP 10x20mm
17290 pcs
1949-62
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OP 10x18mm
14849 pcs
1958-71
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OP 10x15mm
9293 pcs
1950-57
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OP 10x14.5mm
96 pcs
1954
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OP 10x14mm
23900 pcs
1960-74
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OP 8x20mm
2230 pcs
1964-66
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OP 7.5x14mm
13912 pcs
1953-64
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