This model was made by Crosman from 1929-1950. However asking "What is it worth?" is like asking what is my 55 Chevy worth without describing the condition of the car. It it still working. Does it still hold air. What condition is it in. Excellent ( Like brand new) Very good, good, fair, or poor. Give some details about the rifle and I'll try to give you an estimate of it's value. It could be worth a tidy sum of money or nothing.
Between $125 - $165.
From your description I assume you are asking about the Crosman model 102 Rifle not a pellet gun. The 102 is a .22 caliber pump action rifle There are 3 variations of this rifle the 102, 102 OSS and 102 CG. I am going to guess yours is the simple model 102. The early versions had simple checkering on the forearm 1929-1950. In good condition it is worth somewhere in the area of $125-$165. I suggest you read the Blue Book of Airguns 8th edition. there is a lot more info about this model. You can find the book in any large book store.
there are over 100 different model Crosman airguns. You need to specify the model and the condition of the Crosman you want to know about
In good condition it would be worth between $125 - $165. For the Owners/Parts manual see the link below.
I believe Crosman never made a model B661 (But I may be wrong) I've searched the web and 5 different Catalogue Airgun books and can not find any reference to a Crosman Model B661.
Between $125 - $165
I have absolutely no information on a Crosman model 143. Are you sure it isn't a model 140 or model 147. I even searched the net and can not find anything on a model 143.
What model is it. How old is it, what condition is it in, is it still working?
The Crosman model 454 was made between 1977-1982, in two variations it was modeled after the Colt Woodsman. It is a 16 shot BB C02 pistol. It good condition it is worth between $25 - $30.
The Crosman model 160 was made between 1955-71. In mint condition (Very unusual) it is worth between $190 & $225 add 20% for factory box. There were 3 variations of this model.
This model was made between 1964 - 1985 in 3 variations. Today in fair condition it is worth between $25 to $40
I can not find a CROSMAN model 350 BB gun, Do you mean a V350 BB rifle. If so then one in good condition is worth between $55-$70