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| | Tartan Name | Open Championship (1998) |  |  |  | Category | Corporate |  |  |  | Designer | House of Edgar - Macnaughton Holdings Ltd. | STA Ref | 2575 |  | Date Recorded | Not Specified | STWR Ref | 2575 | 
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| | Tartan Name | Open Championship, The |  |  |  | Category | Corporate |  |  |  | Designer | Not Specified | STA Ref | none |  | Date Recorded | Not Specified | STWR Ref | 2803 | 
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| | Tartan Name | Operation Encompass |  |  |  | Category | Corporate | Reference | 11951 |  | Designer | Wilton, Brian |  |  |  | Date Recorded | 19/10/2017 |  |  | 
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| | Tartan Name | Orange Fanaticos |  |  |  | Category | Corporate | Reference | 10105 |  | Designer | Frankfort, David C |  |  |  | Date Recorded | 23/11/2009 |  |  | 
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| | Tartan Name | Order of Saint Lazarus |  |  |  | Category | Corporate | Reference | 11388 |  | Designer | Ross/Waterton-Anderson |  |  |  | Date Recorded | 14/10/2015 |  |  | 
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| | Tartan Name | Order of the Holy Sepulchre |  |  |  | Category | Corporate |  |  |  | Designer | Kinsey, Ronald Stuart | STA Ref | 2161 |  | Date Recorded | Not Specified | STWR Ref | 2161 | 
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| | Tartan Name | Order of Vitéz |  |  |  | Category | Corporate | Reference | 12652 |  | Designer | Wilton, Brian |  |  |  | Date Recorded | 21/10/2019 |  |  | 
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| | Tartan Name | Ordinariate, The |  |  |  | Category | Corporate | Reference | 12554 |  | Designer | Black, Ruth |  |  |  | Date Recorded | 09/07/2019 |  |  | 
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| | Tartan Name | Oregon State University |  |  |  | Category | Corporate | Reference | 10131 |  | Designer | Lorenson, Krisja |  |  |  | Date Recorded | 19/01/2010 |  |  | 
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| | Tartan Name | Oregon, State of |  |  |  | Category | District |  |  |  | Designer | Harding, Robert | STA Ref | 5743 |  | Date Recorded | Not Specified | STWR Ref | none | 
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| | Tartan Name | Oren Peterson |  |  |  | Category | Name | Reference | 10127 |  | Designer | Mark A B Peterson |  |  |  | Date Recorded | 11/01/2010 |  |  | 
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| | Tartan Name | Organic |  |  |  | Category | Fashion | Reference | 11379 |  | Designer | Lochcarron of Scotland |  |  |  | Date Recorded | 25/09/2015 |  |  | 
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| | Tartan Name | Oriel #1 |  |  |  | Category | District |  |  |  | Designer | 'Smith Jnr, Dr Philip D | STA Ref | 2166 |  | Date Recorded | Not Specified | STWR Ref | 2166 | 
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