When you ask for the value of this air gun, you need to give me more information than "How much is it worth?" Let me explain. If I asked you "How much is my 56 T-bird worth?" The first thing you might ask is, "What condition is it in?" It could be a real gem or just a bucket of rust. It's the same with any antique. The current condition determines the value.
You need to give a description of the airgun, give it some sort of rating like, it's in (Poor, Fair, Good, Very Good or Excellent) shape. Or tell me that is looks well used or has very little wear. Something that gives me an idea of where to start. Without more information it is not possible to give you an estimate of value.
BTW your air rifle was made in 1979 or shortly there after.
1105/1
1,221,105
1105 is not prime. 1105 = 5 * 13 * 17
1105 - 407 = 698
Multiples of 1105
no 1105 ends with a 5 so that means that 1105 is divisible by 5 and some other number
1, 5, 17, 65, 221, 1105
1105 221,5 17,13,5
1105
1 and 1105 are one pair.
1105 = 5 x 13 x 17
Any element of the set of numbers of the form 1105*k where k is an integer.