Hi Andreas
The flask looks to be a late 16th to early 17th Century staghorn type poeder flask. Although the metal parts are missing and the engraving seems a bit crude. Possibly done by an amature/hobbist on their first attempt. Here is a Forum Link from about 8 years ago that will give you a better idea of it's origins with comment from Matchlock. I was very fortunate to receive his comments.
http://www.vikingsword.com/vb/showthread.php?t=14271
The length of that rod would be about correct for many pistols. So it could be a Suma as Fernando mentions - with a spike end to double as a stabbing point in a back-up situation. Just my guess.
Rick