Herr Sprocket N205-B7
Unit is .404 Pitch x 7 Tooth Spur with Oiler Cover Flange
Comes with manufacture pressed in bearings
*VERIFY that your machine has .404 PITCH bar & chain setup or sprocket will not work correctly!
Pioneer Models; NU-17, Super 620, 620, 625, H.J.R. Series, 600, 400, 420, 450, 410, 540, 550, 610, 650
Please see pictures for additional reference. 
I buy old shelf stock inventory and parts from closed / shuttered businesses. (New Old Stock)
Could have dirt, dust, topical surface rust, blemish lines, dirty packaging, or no packaging...
The box on this one was toast. Created a sturdy shipping / storage container.
FAST SHIPPING To U.S.A. Buyers!  
I ship at least once every 24 hours during normal business days of the week.
Tracking Number Will Also Be Provided 
***Note to International buyers***   
Any International / Global Shipping and costs, fees, and charges are set by eBay.  
I ship to their U.S.A. terminal only 
I have no control over the shipping charges, fees, or delays for any sales outside of the U.S.A.! 
Thank you for your interest!