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| Tartan Name | One Account | | | | Category | Corporate
| | | | Designer | Virgin One | STA Ref | 3912 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | One World Together | | | | Category | Other | Reference | 12827 | | Designer | Paterson, Robert & Campbell, Keri | | | | Date Recorded | 28/04/2020 | | |
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| Tartan Name | Oneness | | | | Category | Corporate
| Reference | 11102 | | Designer | Urquhart, Blair | | | | Date Recorded | 06/08/2014 | | |
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| Tartan Name | Ontario | | | | Category | District
| | | | Designer | Not Specified | STA Ref | none | | Date Recorded | Not Specified | STWR Ref | 2142 |
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| Tartan Name | Ontario (Official) | | | | Category | District
| | | | Designer | MacNeil, Jim | STA Ref | 6627 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Ontario Centennial | | | | Category | Fashion
| | | | Designer | Pik Mills? | STA Ref | 2038 | | Date Recorded | Not Specified | STWR Ref | 2038 |
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| Tartan Name | Ontario Provincial Police | | | | Category | Corporate
| Reference | 10019 | | Designer | Brown, David & Hall, Fiona | | | | Date Recorded | 23/04/2009 | | |
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| Tartan Name | Ontario, Ensign of | | | | Category | District
| | | | Designer | Rotex Ltd | STA Ref | 3140 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Ontario, Northern | | | | Category | District
| | | | Designer | Teall/Smith | STA Ref | 956 | | Date Recorded | Not Specified | STWR Ref | 956 |
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| Tartan Name | Ontex | | | | Category | Corporate
| Reference | 11358 | | Designer | McCann/Urquhart | | | | Date Recorded | 03/09/2015 | | |
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| Tartan Name | Ooni Limited | | | | Category | Corporate
| Reference | 13649 | | Designer | Prickly Thistle Scotland Ltd | | | | Date Recorded | 11/10/2022 | | |
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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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