That was a design I chased after for a few years here in the states, and I gave up before I ever found a good one. Most of them, here, anyway, are pretty old and have seen either, a lot, or, hard use.
Most people in this country think they are looking at just another boxlock, might be even harder to sell than a sidelock.
Nice, well put together guns, but, I might buy an annuity if I was worried about the money.

Best,
Ted