a very interesting hunting rifle serial number 2798
Cal. d. Zdsn. 0.60''-5/24 Pulv - I dont find an answer for "Zdsn" but the sice of the receiver and 0,60" makes me thinking its for the prussian military cartridge

the bolt close with a cone over the barrel and the bolt handle have the typical slant position of the military rifle. but look at the bolt closly there are rear locking lugs and if this is realy the case the action is very advanced.
if this is in the serial numbers of the hunting guns(?) it will be made around 1870/71.
you see parts on this rifle coming from the double gun line.

"Dreyse - Gentleman’s Sporting Rifle, Antique, approx 1850s, Single shot bolt action Dreyse needle fire sporting rifle - 27.25" swamped octagon barrel, dovetail blade front, adjustable rear sight - walnut stock - legible markings - pleasing even patina on barrel with small spots of rust that might be carefully cleaned; platinum ring at muzzle. Frame, bolt handle, butt plate, escutcheons, ornate patch box, and trigger guard are all soft gray German silver with good quality period scroll engraving. Barrel marked ''v. Dreyse. Sommerda.''; right side frame ''Cal. d. Zdsn. 0.60''-5/24 Pulv.'' Horn flared nose cap and trigger guard extension. Sound full length stock shows usage marks and sharp checkering, Double set trigger, engraved length on bolt for replacement needle. (7th jpeg) Matching numbers on Bolt Receiver sights and barrel. Excellent Working condition. SN 2798 ... "

http://www.gunauction.com/buy/10365597/g...ble-set-trigger

here is a rare example of a sporter made probably by a german gunsmith in the 1880s. lookslike a octagonal barrel and double set trigger so a M 65 Jägerbüchse was sporterized.

http://www.gundigest.com/military-firearms/the-needle-gun-started-it-all