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All TA's are stamped with USA and the date they were made....... apart from the K# ones. I've got a copy of an early test article from BMXA that states the first production TA's were made in Japan because the teardrop tubing wasn't available in America at the time. These i surmise are the K numbered ones. The only difference is the placing of the flex holes at the drop-outs.
Anyone that has a TA can they give us the date and what bridge it has and we could probably get some answers.