Thank you for posting that fine combined spanner and priming flask; it is in optimum patinated surface condition and was made in Nuremberg in about 1550. Would you have expected it to be as early as that?
An almost identical sample is in my collection.
I just have started a separate thread on early wheel-lock spanners and their dating:
and it would be great if you attach the images of your piece there as well.
All the best,