That's extremely interesting. This was a year before Beck arrived, correct?
I know Betz had originally been working in the blacksmith shop, but then was moved into his own gunsmith shop before Beck arrived. It's never been clear to me whether Betz was capable (at that early point, anyway) of stocking a gun as opposed to simply repairing one. Going by Fries translations, it would seem there was a fairly strong demand for repair work (Betz did get his own shop, after all).
I wonder if van de Merck was granted permission to stock guns because Betz either was not competent at such work, or was too busy with assorted other repairs to do so?
I wonder what happens to van de Merck when Beck arrived?