Can someone please ID this vintage Triumph for me?

Jerm

XS650 Junkie
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Here is the only picture I have. No VIN available to me at this moment. Thanks in advance for any info.
 

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I'm not expert but I believe it's a mid 50's Pre-unit thunderbird. Probably a 650. Best guess on the year would be 1957.
 
best guess without engine or frame number would be 1957 5T or 6T, the tank badge & full width front brake hub was introduced in 1957, the colour suggests a 5T but could have undergone many changes in over 50 years..........engine type should be stamped on engine block............very nice tho, i have a 1972 T120R
 
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