Most air rifles sold for around $20 to $30 in the 1960's
about $85 --------New Answer---------------- As of Sept, 2011 the Daisy Grizzly cost about $35.50. Crosman never made a Grizzly model air rifle.
The Bone collector is a far superior air rifle but will cost you almost twice as much as the Fury. It's up to you and what you can afford.
Currently it is selling for $69.99. I suggest that you also look at the Crosman 2104x, it's the same rifle, I would suggest that you look at the "pyramydair" home page to see both of these rifles.
Right around $80 +or -.
Depended on the rifle. $5-$500
blue
The average cost of regular gasolene in 1960 was $0.31 .
You have blown seals or O-Rings. The rifle was made from 1975 to 1982. Crosman no longer makes parts for this airgun. BUT they offer a service to locate repair shops that repair the rifle. See the link Below. But first consider this. IF the rifle was in working order AND it was in perfect shape it would be worth around $50 to $60. Is it worth repairing? It would cost you almost that much to have it repaired. Today you can purchase a brand new Crosman 2100 ( almost Identical to your old 766 ) for $60 through "Pyramyd air" See the link below. It's up to you.
the Crosman Model 400 was made in two variations. The first was made between 1957-62 the second was made between 1962-64. It's a .22 caliber pellet rifle. Without more information about the condition of the rifle it is not possible to give you and estimate of value.
This particular model was made by Crosman air gun company for Sears. In reality it is a Crosman model V350. In order to give you an estimate of value. You need to state the current condition of the rifle. Without some sort of rating from Poor To Excellent, It is not possible to answer you
The Model 761 made by Crosman was made between 1978 to 1981. It is no longer in production. Therefor no one has a new one for sale.
Crosman and Daisy made air rifles for Sears under the JC Higgins name. Yours is a model 400 Crosman. However you did not state the condition of the rifle so no estimate of value can be given. However yours was made between 1957-64.