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| Tartan Name | O'Buckley (2017) | | | | Category | Name
| Reference | 11771 | | Designer | Buckley, Colin | | | | Date Recorded | 25/04/2017 | | |
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| Tartan Name | O'Connor / Ochiltree | | | | Category | Name
| | | | Designer | Smith Jnr, Dr Philip D | STA Ref | 321 | | Date Recorded | Not Specified | STWR Ref | 321 |
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| Tartan Name | O'Connor, Hugh (Personal) | | | | Category | Name
| Reference | 11339 | | Designer | Geoffrey (Tailor) Highland Crafts | | | | Date Recorded | 13/08/2015 | | |
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| Tartan Name | O'Long (Personal) | | | | Category | Name
| | | | Designer | Tartanweb | STA Ref | 7246 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | O'Monaghan (Personal) | | | | Category | Name
| | | | Designer | Scarlett MBE, Jamie | STA Ref | 6266 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | O'Neill (Australia) | | | | Category | Clan/Family | | | | Designer | Not Specified | STA Ref | 2464 | | Date Recorded | Not Specified | STWR Ref | 2464 |
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| Tartan Name | O'Neill Pipe Band 1983 | | | | Category | Corporate
| | | | Designer | Johnston, Bill | STA Ref | 5536 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | O2 (Personal) | | | | Category | Corporate
| | | | Designer | Wilton, Brian | STA Ref | 7088 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Oakley (2015) | | | | Category | Name
| Reference | 11255 | | Designer | Oakley, R | | | | Date Recorded | 18/03/2015 | | |
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| Tartan Name | Ocean Sciences 2026 | | | | Category | Corporate
| Reference | 14620 | | Designer | Wilton, Brian | | | | Date Recorded | 21/01/2025 | | |
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