Crosman no longer repairs older air rifles, But there are several places around the country that specialize in air gun repair. Crosman offers a service to locate these shops for you. See the link below and click on "Find a service center" at the bottom of the page. You can also find the original owners manual on the same Crosman page.
The Model 104 was made in 1949. Unfortunately you did not state the condition of the Rifle so no estimate of value can be given. Does it still work? Is it in excellent condition, very good, good, fair or poor condition. You need to give me more information before I can give you an estimate of value.
The model 104 was made between 1966-74. you will have to give more information on the condition of the rifle in order to get an estimate of value.
On the frame
Daisy Model 104 Golden Eagle BB: 500 shot, plastic stock. made between 1966-74
$125 to $165 in Good overall appearance and working condition. $165 to $200 in Very Good appearance and working condition.
1943
@ 1968
Made in 1966.
Impossible to answer without knowing who made it.
47 years old.
44 years old
40-300 usd