Hawthorne was made by Crosman for Wards. I suggest looking up on the net under "Air Gun Repair" for someone close to you.
I'm going to try to answer this in two parts. 1. Montgomery Wards Pellet rifles and guns were made by Crosman corp under the Hawthorne name. 2. This is pure speculation and a best guess. I believe the m140 is the "Crosman model 140" it is a pump, single shot, 22 cal pellet rifle. It had a wooden stock with the forearm as the pump handle. there were 3 variations made, starting in 1954 ending in 1968.
I suggest you try the link below. Or search the web for "Air gun repair."
See the link below for the parts list and phone number for Crosman.
I would try the internet, gun shops, gun shows, sporting goods stores, want ads.
It depends on the model and the caliber of the Pellet gun.
I kid you not. I see maybe one in a thousand questions about air gun that ask about the Montgomery Ward Hawthorne brand Air gun. Unfortunately my catalogues sources has very little to say about the crossover brand. I do know that all the airguns for Wards were made by Crosman air gun company under the Hawthorne brand name. My books only list 10 crossover models, but I know there were more. Of the 10 listed only one is a pistol and that a Crosman 38T or 38C. it looks like an old Colt 38 firearm. This may be your pellet gun. ( Both of these came in .177 and .22 caliber.) Now as for value. It's hard to set an estimated value without more information about the pellet gun. You will have to give it some sort of rating like Poor, Fair, Good, Very Good or Excellent so I can set a value. See the link below for all the owners manual and parts manuals made by Crosman.
Looks like Savage built them. Their model SB100B. Hawthorne model name was "Vulcan". Parts are available from Numrich Gun Parts. Good to see someone else owns one.
I think you mean pellet gun. That is a gun that fires a small lead pellet but does not use gun powder. It uses compressed air or compressed gasses to push the pellet.
A pellet gun is not adequate for protection, and will get you arrested.
Any pellet gun should be handled like a real firearm. Yes you can be killed with a pellet gun under the right circumstances.
It all depends on the model and who made the pellet gun. I suggest that you re-post the queston with the model and make of the pellet gun to get an answer.