First take the strobe conection off to see if you have 2 or 3 pins. The two pin conection can not be made to work with any eletronic strobe, it only works with the old flash bulb system. If it has 2 pins, it would need to be converted to 3 - so that is a value minus.
Next, do you have a lenes to go with it, if so what do you have? Almost all bodies come with a 35mm, but there are 80, 28, 20, and 15mm lens also and the small the number the more valuable it is.
After that it is all on condition, the Nik II is not a popular as a Nik III as the improvements between the II and III make the III much more reliable.
But on the whole, the Nik II is a colectors item and it will all depend if you have a collector willing to pay the coin when you sell.
Log onto Ebay and check completed items for the Nikonos II and see what they are going for.