Nobody is likely to pay 7,000 for a no name box lock. Asking and getting are two different things. For seven grand you can find a not too worn out named London side lock. I suspect if you looked hard you could find a few $7,000 box locks but only a few. The tip of an iceberg.
I wonder who made it, and then why. Was it by request of a buyer? Was it done by someone in the trade as a proof of what could be done if money was no object? You can’t build a reputation for fine work without a signature. Perhaps it was done in the trade for personal use.
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