A Snap Tinderlock Haquebut, ca.1515-20 , in the Tojhusmuseet Copenhagen

[Matchlock]

A second thought:

It is even possible, if not probable, that the stock was made as late as the 1560's because it already shows the characteristic deeply cut thumb rest of the early Spanish-Netherlandish musket stocks.
No other stock with this thumb rest is known before that period - and certainly not of the second decade of the 16th c.

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