A Bruckner Test Record?

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A 7 inch 45 rpm tengineering test record produced by the BBC recently sold on Ebay for over $125.00. What makes the record of interest here is that the second side of the disc contains the end of the first movement of the Bruckner Symphony No. 5. I suppose that this was considered a good test for stylus tracking. There is no mention of performers which makes it hard to list anywhere in the discography.